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          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_CreditDefaultSwapsRiskMember" xlink:label="loc_cik0001318025_CreditDefaultSwapsRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_CreditDefaultSwapsRiskMember" xml:lang="en-US">Credit Default Swaps Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_CreditDefaultSwapsRiskMember" xlink:to="lab_cik0001318025_CreditDefaultSwapsRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_CreditRisksMember" xlink:label="loc_cik0001318025_CreditRisksMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_CreditRisksMember" xml:lang="en-US">Credit Risks [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_CreditRisksMember" xlink:to="lab_cik0001318025_CreditRisksMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_CsdrRelatedRiskMember" xlink:label="loc_cik0001318025_CsdrRelatedRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_CsdrRelatedRiskMember" xml:lang="en-US">CSDR Related Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_CsdrRelatedRiskMember" xlink:to="lab_cik0001318025_CsdrRelatedRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_CurrencyRiskMember" xlink:label="loc_cik0001318025_CurrencyRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_CurrencyRiskMember" xml:lang="en-US">Currency Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_CurrencyRiskMember" xlink:to="lab_cik0001318025_CurrencyRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_CyberSecurityRiskMember" xlink:label="loc_cik0001318025_CyberSecurityRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_CyberSecurityRiskMember" xml:lang="en-US">Cyber Security Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_CyberSecurityRiskMember" xlink:to="lab_cik0001318025_CyberSecurityRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_DebtSecuritiesRiskMember" xlink:label="loc_cik0001318025_DebtSecuritiesRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_DebtSecuritiesRiskMember" xml:lang="en-US">Debt Securities Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_DebtSecuritiesRiskMember" xlink:to="lab_cik0001318025_DebtSecuritiesRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_DerivativesRiskMember" xlink:label="loc_cik0001318025_DerivativesRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_DerivativesRiskMember" xml:lang="en-US">Derivatives Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_DerivativesRiskMember" xlink:to="lab_cik0001318025_DerivativesRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_DistressedAndDefaultedSecuritiesRiskMember" xlink:label="loc_cik0001318025_DistressedAndDefaultedSecuritiesRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_DistressedAndDefaultedSecuritiesRiskMember" xml:lang="en-US">Distressed and Defaulted Securities Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_DistressedAndDefaultedSecuritiesRiskMember" xlink:to="lab_cik0001318025_DistressedAndDefaultedSecuritiesRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_DistributionRateRiskMember" xlink:label="loc_cik0001318025_DistributionRateRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_DistributionRateRiskMember" xml:lang="en-US">Distribution Rate Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_DistributionRateRiskMember" xlink:to="lab_cik0001318025_DistributionRateRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_EmergingMarketsRiskMember" xlink:label="loc_cik0001318025_EmergingMarketsRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_EmergingMarketsRiskMember" xml:lang="en-US">Emerging Markets Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_EmergingMarketsRiskMember" xlink:to="lab_cik0001318025_EmergingMarketsRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_EnergySectorRiskMember" xlink:label="loc_cik0001318025_EnergySectorRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_EnergySectorRiskMember" xml:lang="en-US">Energy Sector Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_EnergySectorRiskMember" xlink:to="lab_cik0001318025_EnergySectorRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_EquitySecuritiesAndRelatedMarketRiskMember" xlink:label="loc_cik0001318025_EquitySecuritiesAndRelatedMarketRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_EquitySecuritiesAndRelatedMarketRiskMember" xml:lang="en-US">Equity Securities and Related Market Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_EquitySecuritiesAndRelatedMarketRiskMember" xlink:to="lab_cik0001318025_EquitySecuritiesAndRelatedMarketRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_FocusedInvestmentRiskMember" xlink:label="loc_cik0001318025_FocusedInvestmentRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_FocusedInvestmentRiskMember" xml:lang="en-US">Focused Investment Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_FocusedInvestmentRiskMember" xlink:to="lab_cik0001318025_FocusedInvestmentRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_ForeignLoanOriginationsRiskMember" xlink:label="loc_cik0001318025_ForeignLoanOriginationsRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_ForeignLoanOriginationsRiskMember" xml:lang="en-US">Foreign Loan Originations Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_ForeignLoanOriginationsRiskMember" xlink:to="lab_cik0001318025_ForeignLoanOriginationsRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_ForeignNonUSGovernmentSecuritiesRiskMember" xlink:label="loc_cik0001318025_ForeignNonUSGovernmentSecuritiesRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_ForeignNonUSGovernmentSecuritiesRiskMember" xml:lang="en-US">Foreign (Non-U.S.) Government Securities Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_ForeignNonUSGovernmentSecuritiesRiskMember" xlink:to="lab_cik0001318025_ForeignNonUSGovernmentSecuritiesRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_ForeignNonUsInvestmentRiskMember" xlink:label="loc_cik0001318025_ForeignNonUsInvestmentRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_ForeignNonUsInvestmentRiskMember" xml:lang="en-US">Foreign (Non U.S.) Investment Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_ForeignNonUsInvestmentRiskMember" xlink:to="lab_cik0001318025_ForeignNonUsInvestmentRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_HighYieldSecuritiesRiskMember" xlink:label="loc_cik0001318025_HighYieldSecuritiesRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_HighYieldSecuritiesRiskMember" xml:lang="en-US">High Yield Securities Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_HighYieldSecuritiesRiskMember" xlink:to="lab_cik0001318025_HighYieldSecuritiesRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_IndustrySpecificRisksMember" xlink:label="loc_cik0001318025_IndustrySpecificRisksMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_IndustrySpecificRisksMember" xml:lang="en-US">Industry Specific Risks [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_IndustrySpecificRisksMember" xlink:to="lab_cik0001318025_IndustrySpecificRisksMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_InflationdeflationRiskMember" xlink:label="loc_cik0001318025_InflationdeflationRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_InflationdeflationRiskMember" xml:lang="en-US">Inflation/Deflation Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_InflationdeflationRiskMember" xlink:to="lab_cik0001318025_InflationdeflationRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_InflationindexedSecurityRiskMember" xlink:label="loc_cik0001318025_InflationindexedSecurityRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_InflationindexedSecurityRiskMember" xml:lang="en-US">Inflation-Indexed Security Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_InflationindexedSecurityRiskMember" xlink:to="lab_cik0001318025_InflationindexedSecurityRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_InsurancelinkedAndOtherInstrumentsRiskMember" xlink:label="loc_cik0001318025_InsurancelinkedAndOtherInstrumentsRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_InsurancelinkedAndOtherInstrumentsRiskMember" xml:lang="en-US">Insurance-Linked and Other Instruments Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_InsurancelinkedAndOtherInstrumentsRiskMember" xlink:to="lab_cik0001318025_InsurancelinkedAndOtherInstrumentsRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_InterestRateRisk1Member" xlink:label="loc_cik0001318025_InterestRateRisk1Member" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_InterestRateRisk1Member" xml:lang="en-US">Interest Rate Risk1 [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_InterestRateRisk1Member" xlink:to="lab_cik0001318025_InterestRateRisk1Member" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_IssuerRiskMember" xlink:label="loc_cik0001318025_IssuerRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_IssuerRiskMember" xml:lang="en-US">Issuer Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_IssuerRiskMember" xlink:to="lab_cik0001318025_IssuerRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_LeverageRiskMember" xlink:label="loc_cik0001318025_LeverageRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_LeverageRiskMember" xml:lang="en-US">Leverage Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_LeverageRiskMember" xlink:to="lab_cik0001318025_LeverageRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_LimitedTermRiskMember" xlink:label="loc_cik0001318025_LimitedTermRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_LimitedTermRiskMember" xml:lang="en-US">Limited Term Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_LimitedTermRiskMember" xlink:to="lab_cik0001318025_LimitedTermRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_LiquidityRiskMember" xlink:label="loc_cik0001318025_LiquidityRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_LiquidityRiskMember" xml:lang="en-US">Liquidity Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_LiquidityRiskMember" xlink:to="lab_cik0001318025_LiquidityRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_LoanOriginationRiskMember" xlink:label="loc_cik0001318025_LoanOriginationRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_LoanOriginationRiskMember" xml:lang="en-US">Loan Origination Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_LoanOriginationRiskMember" xlink:to="lab_cik0001318025_LoanOriginationRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_LoansAndOtherIndebtednessLoanAcquisitionsParticipationsAndAssignmentsRiskMember" xlink:label="loc_cik0001318025_LoansAndOtherIndebtednessLoanAcquisitionsParticipationsAndAssignmentsRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_LoansAndOtherIndebtednessLoanAcquisitionsParticipationsAndAssignmentsRiskMember" xml:lang="en-US">Loans and Other Indebtedness Loan Acquisitions Participations and Assignments Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_LoansAndOtherIndebtednessLoanAcquisitionsParticipationsAndAssignmentsRiskMember" xlink:to="lab_cik0001318025_LoansAndOtherIndebtednessLoanAcquisitionsParticipationsAndAssignmentsRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_ManagementRiskMember" xlink:label="loc_cik0001318025_ManagementRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_ManagementRiskMember" xml:lang="en-US">Management Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_ManagementRiskMember" xlink:to="lab_cik0001318025_ManagementRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_MarketDiscountRiskMember" xlink:label="loc_cik0001318025_MarketDiscountRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_MarketDiscountRiskMember" xml:lang="en-US">Market Discount Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_MarketDiscountRiskMember" xlink:to="lab_cik0001318025_MarketDiscountRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_MarketDisruptionsRiskMember" xlink:label="loc_cik0001318025_MarketDisruptionsRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_MarketDisruptionsRiskMember" xml:lang="en-US">Market Disruptions Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_MarketDisruptionsRiskMember" xlink:to="lab_cik0001318025_MarketDisruptionsRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_MarketRiskMember" xlink:label="loc_cik0001318025_MarketRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_MarketRiskMember" xml:lang="en-US">Market Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_MarketRiskMember" xlink:to="lab_cik0001318025_MarketRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_MortgagerelatedAndOtherAssetbackedInstrumentsRiskMember" xlink:label="loc_cik0001318025_MortgagerelatedAndOtherAssetbackedInstrumentsRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_MortgagerelatedAndOtherAssetbackedInstrumentsRiskMember" xml:lang="en-US">MortgageRelated and Other AssetBacked Instruments Risk [Member]</link:label>
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_cik0001318025_MortgagerelatedAndOtherAssetbackedInstrumentsRiskMember" xml:lang="en-US">Mortgage-Related and Other Asset-Backed Instruments Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_MortgagerelatedAndOtherAssetbackedInstrumentsRiskMember" xlink:to="lab_cik0001318025_MortgagerelatedAndOtherAssetbackedInstrumentsRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_MortgagerelatedDerivativeInstrumentsRiskMember" xlink:label="loc_cik0001318025_MortgagerelatedDerivativeInstrumentsRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_MortgagerelatedDerivativeInstrumentsRiskMember" xml:lang="en-US">MortgageRelated Derivative Instruments Risk [Member]</link:label>
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="lab_cik0001318025_MortgagerelatedDerivativeInstrumentsRiskMember" xml:lang="en-US">Mortgage-Related Derivative Instruments Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_MortgagerelatedDerivativeInstrumentsRiskMember" xlink:to="lab_cik0001318025_MortgagerelatedDerivativeInstrumentsRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_MunicipalBondRiskMember" xlink:label="loc_cik0001318025_MunicipalBondRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_MunicipalBondRiskMember" xml:lang="en-US">Municipal Bond Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_MunicipalBondRiskMember" xlink:to="lab_cik0001318025_MunicipalBondRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_NonDiversificationRiskMember" xlink:label="loc_cik0001318025_NonDiversificationRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_NonDiversificationRiskMember" xml:lang="en-US">Non Diversification Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_NonDiversificationRiskMember" xlink:to="lab_cik0001318025_NonDiversificationRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_OperationalRiskMember" xlink:label="loc_cik0001318025_OperationalRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_OperationalRiskMember" xml:lang="en-US">Operational Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_OperationalRiskMember" xlink:to="lab_cik0001318025_OperationalRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_OtherInvestmentCompaniesRiskMember" xlink:label="loc_cik0001318025_OtherInvestmentCompaniesRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_OtherInvestmentCompaniesRiskMember" xml:lang="en-US">Other Investment Companies Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_OtherInvestmentCompaniesRiskMember" xlink:to="lab_cik0001318025_OtherInvestmentCompaniesRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_OtherPooledInvestmentVehiclesRiskMember" xlink:label="loc_cik0001318025_OtherPooledInvestmentVehiclesRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_OtherPooledInvestmentVehiclesRiskMember" xml:lang="en-US">Other Pooled Investment Vehicles Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_OtherPooledInvestmentVehiclesRiskMember" xlink:to="lab_cik0001318025_OtherPooledInvestmentVehiclesRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_PlatformRiskMember" xlink:label="loc_cik0001318025_PlatformRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_PlatformRiskMember" xml:lang="en-US">Platform Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_PlatformRiskMember" xlink:to="lab_cik0001318025_PlatformRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_PortfolioTurnoverRiskMember" xlink:label="loc_cik0001318025_PortfolioTurnoverRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_PortfolioTurnoverRiskMember" xml:lang="en-US">Portfolio Turnover Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_PortfolioTurnoverRiskMember" xlink:to="lab_cik0001318025_PortfolioTurnoverRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_PotentialConflictsOfInterestRiskAllocationOfInvestmentOpportunitiesMember" xlink:label="loc_cik0001318025_PotentialConflictsOfInterestRiskAllocationOfInvestmentOpportunitiesMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_PotentialConflictsOfInterestRiskAllocationOfInvestmentOpportunitiesMember" xml:lang="en-US">Potential Conflicts of Interest Risk &#8212; Allocation of Investment Opportunities [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_PotentialConflictsOfInterestRiskAllocationOfInvestmentOpportunitiesMember" xlink:to="lab_cik0001318025_PotentialConflictsOfInterestRiskAllocationOfInvestmentOpportunitiesMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_PreferredSecuritiesRiskMember" xlink:label="loc_cik0001318025_PreferredSecuritiesRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_PreferredSecuritiesRiskMember" xml:lang="en-US">Preferred Securities Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_PreferredSecuritiesRiskMember" xlink:to="lab_cik0001318025_PreferredSecuritiesRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_PrepaymentsRiskMember" xlink:label="loc_cik0001318025_PrepaymentsRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_PrepaymentsRiskMember" xml:lang="en-US">Prepayments Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_PrepaymentsRiskMember" xlink:to="lab_cik0001318025_PrepaymentsRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_PrivacyAndDataSecurityRiskMember" xlink:label="loc_cik0001318025_PrivacyAndDataSecurityRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_PrivacyAndDataSecurityRiskMember" xml:lang="en-US">Privacy and Data Security Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_PrivacyAndDataSecurityRiskMember" xlink:to="lab_cik0001318025_PrivacyAndDataSecurityRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_PrivateFundsRiskTaxRiskMember" xlink:label="loc_cik0001318025_PrivateFundsRiskTaxRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_PrivateFundsRiskTaxRiskMember" xml:lang="en-US">Private Funds Risk &#8212; Tax Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_PrivateFundsRiskTaxRiskMember" xlink:to="lab_cik0001318025_PrivateFundsRiskTaxRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_PrivatelyIssuedMortgageRelatedSecuritiesRiskMember" xlink:label="loc_cik0001318025_PrivatelyIssuedMortgageRelatedSecuritiesRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_PrivatelyIssuedMortgageRelatedSecuritiesRiskMember" xml:lang="en-US">Privately Issued Mortgage-Related Securities Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_PrivatelyIssuedMortgageRelatedSecuritiesRiskMember" xlink:to="lab_cik0001318025_PrivatelyIssuedMortgageRelatedSecuritiesRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_PrivatePlacementsAndRestrictedSecuritiesRiskMember" xlink:label="loc_cik0001318025_PrivatePlacementsAndRestrictedSecuritiesRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_PrivatePlacementsAndRestrictedSecuritiesRiskMember" xml:lang="en-US">Private Placements and Restricted Securities Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_PrivatePlacementsAndRestrictedSecuritiesRiskMember" xlink:to="lab_cik0001318025_PrivatePlacementsAndRestrictedSecuritiesRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_PrivateRealEstateInvestmentsRiskMember" xlink:label="loc_cik0001318025_PrivateRealEstateInvestmentsRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_PrivateRealEstateInvestmentsRiskMember" xml:lang="en-US">Private Real Estate Investments Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_PrivateRealEstateInvestmentsRiskMember" xlink:to="lab_cik0001318025_PrivateRealEstateInvestmentsRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_RealEstateRiskMember" xlink:label="loc_cik0001318025_RealEstateRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_RealEstateRiskMember" xml:lang="en-US">Real Estate Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_RealEstateRiskMember" xlink:to="lab_cik0001318025_RealEstateRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_RegulationSSecuritiesRiskMember" xlink:label="loc_cik0001318025_RegulationSSecuritiesRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_RegulationSSecuritiesRiskMember" xml:lang="en-US">Regulation S Securities Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_RegulationSSecuritiesRiskMember" xlink:to="lab_cik0001318025_RegulationSSecuritiesRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_RegulatoryChangesRiskMember" xlink:label="loc_cik0001318025_RegulatoryChangesRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_RegulatoryChangesRiskMember" xml:lang="en-US">Regulatory Changes Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_RegulatoryChangesRiskMember" xlink:to="lab_cik0001318025_RegulatoryChangesRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_RegulatoryRiskCommodityPoolOperatorMember" xlink:label="loc_cik0001318025_RegulatoryRiskCommodityPoolOperatorMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_RegulatoryRiskCommodityPoolOperatorMember" xml:lang="en-US">Regulatory Risk &#8212; Commodity Pool Operator [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_RegulatoryRiskCommodityPoolOperatorMember" xlink:to="lab_cik0001318025_RegulatoryRiskCommodityPoolOperatorMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_ReinvestmentRiskMember" xlink:label="loc_cik0001318025_ReinvestmentRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_ReinvestmentRiskMember" xml:lang="en-US">Reinvestment Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_ReinvestmentRiskMember" xlink:to="lab_cik0001318025_ReinvestmentRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_ReitRiskMember" xlink:label="loc_cik0001318025_ReitRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_ReitRiskMember" xml:lang="en-US">REIT Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_ReitRiskMember" xlink:to="lab_cik0001318025_ReitRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_RepurchaseAgreementsRiskMember" xlink:label="loc_cik0001318025_RepurchaseAgreementsRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_RepurchaseAgreementsRiskMember" xml:lang="en-US">Repurchase Agreements Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_RepurchaseAgreementsRiskMember" xlink:to="lab_cik0001318025_RepurchaseAgreementsRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_RiskOfInvestingInChinaMember" xlink:label="loc_cik0001318025_RiskOfInvestingInChinaMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_RiskOfInvestingInChinaMember" xml:lang="en-US">Risk of Investing in China [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_RiskOfInvestingInChinaMember" xlink:to="lab_cik0001318025_RiskOfInvestingInChinaMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_RiskRetentionInvestmentRiskMember" xlink:label="loc_cik0001318025_RiskRetentionInvestmentRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_RiskRetentionInvestmentRiskMember" xml:lang="en-US">Risk Retention Investment Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_RiskRetentionInvestmentRiskMember" xlink:to="lab_cik0001318025_RiskRetentionInvestmentRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_RisksOfDebtSecuritiesOfMLPsMember" xlink:label="loc_cik0001318025_RisksOfDebtSecuritiesOfMLPsMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_RisksOfDebtSecuritiesOfMLPsMember" xml:lang="en-US">Risks of Debt Securities of MLPs [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_RisksOfDebtSecuritiesOfMLPsMember" xlink:to="lab_cik0001318025_RisksOfDebtSecuritiesOfMLPsMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_RisksOfEquitySecuritiesOfMLPsMember" xlink:label="loc_cik0001318025_RisksOfEquitySecuritiesOfMLPsMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_RisksOfEquitySecuritiesOfMLPsMember" xml:lang="en-US">Risks of Equity Securities of MLPs [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_RisksOfEquitySecuritiesOfMLPsMember" xlink:to="lab_cik0001318025_RisksOfEquitySecuritiesOfMLPsMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_RisksOfETNsMember" xlink:label="loc_cik0001318025_RisksOfETNsMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_RisksOfETNsMember" xml:lang="en-US">Risks of ETNs [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_RisksOfETNsMember" xlink:to="lab_cik0001318025_RisksOfETNsMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_SecuritiesLendingRiskMember" xlink:label="loc_cik0001318025_SecuritiesLendingRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_SecuritiesLendingRiskMember" xml:lang="en-US">Securities Lending Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_SecuritiesLendingRiskMember" xlink:to="lab_cik0001318025_SecuritiesLendingRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_SeniorDebtRiskMember" xlink:label="loc_cik0001318025_SeniorDebtRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_SeniorDebtRiskMember" xml:lang="en-US">Senior Debt Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_SeniorDebtRiskMember" xlink:to="lab_cik0001318025_SeniorDebtRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_ShortExposureRiskMember" xlink:label="loc_cik0001318025_ShortExposureRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_ShortExposureRiskMember" xml:lang="en-US">Short Exposure Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_ShortExposureRiskMember" xlink:to="lab_cik0001318025_ShortExposureRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_SmallerCompanyRiskMember" xlink:label="loc_cik0001318025_SmallerCompanyRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_SmallerCompanyRiskMember" xml:lang="en-US">Smaller Company Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_SmallerCompanyRiskMember" xlink:to="lab_cik0001318025_SmallerCompanyRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_SovereignDebtRiskMember" xlink:label="loc_cik0001318025_SovereignDebtRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_SovereignDebtRiskMember" xml:lang="en-US">Sovereign Debt Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_SovereignDebtRiskMember" xlink:to="lab_cik0001318025_SovereignDebtRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_SpecialPurposeAcquisitionCompaniesSpacsRiskMember" xlink:label="loc_cik0001318025_SpecialPurposeAcquisitionCompaniesSpacsRiskMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_SpecialPurposeAcquisitionCompaniesSpacsRiskMember" xml:lang="en-US">Special Purpose Acquisition Companies (SPACs) Risk [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_SpecialPurposeAcquisitionCompaniesSpacsRiskMember" xlink:to="lab_cik0001318025_SpecialPurposeAcquisitionCompaniesSpacsRiskMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_StructuredInvestmentsRisMember" xlink:label="loc_cik0001318025_StructuredInvestmentsRisMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_StructuredInvestmentsRisMember" xml:lang="en-US">Structured Investments Ris [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_StructuredInvestmentsRisMember" xlink:to="lab_cik0001318025_StructuredInvestmentsRisMember" />
          <link:loc xlink:type="locator" xlink:href="cik0001318025-20250630.xsd#cik0001318025_CommonSharesMember" xlink:label="loc_cik0001318025_CommonSharesMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_cik0001318025_CommonSharesMember" xml:lang="en-US">Common Shares [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cik0001318025_CommonSharesMember" xlink:to="lab_cik0001318025_CommonSharesMember" />
        </link:labelLink>
      </link:linkbase>
    </appinfo>
  </annotation>
  <import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" />
  <import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <import namespace="http://xbrl.sec.gov/dei/2025" schemaLocation="https://xbrl.sec.gov/dei/2025/dei-2025.xsd" />
  <import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd" />
  <import namespace="http://xbrl.sec.gov/cef/2025" schemaLocation="https://xbrl.sec.gov/cef/2025/cef-2025.xsd" />
  <import namespace="http://xbrl.sec.gov/cef-pre/2025" schemaLocation="https://xbrl.sec.gov/cef/2025/cef-2025_pre.xsd" />
  <element name="AntiTakeoverProvisionsMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_AntiTakeoverProvisionsMember" substitutionGroup="xbrli:item" />
  <element name="SubprimeRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_SubprimeRiskMember" substitutionGroup="xbrli:item" />
  <element name="SubsidiaryRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_SubsidiaryRiskMember" substitutionGroup="xbrli:item" />
  <element name="SyntheticConvertibleSecuritiesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_SyntheticConvertibleSecuritiesRiskMember" substitutionGroup="xbrli:item" />
  <element name="TaxRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_TaxRiskMember" substitutionGroup="xbrli:item" />
  <element name="TotalReturnSwapRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_TotalReturnSwapRiskMember" substitutionGroup="xbrli:item" />
  <element name="UseOfDerivativesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_UseOfDerivativesMember" substitutionGroup="xbrli:item" />
  <element name="UsGovernmentSecuritiesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_UsGovernmentSecuritiesRiskMember" substitutionGroup="xbrli:item" />
  <element name="ValuationRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_ValuationRiskMember" substitutionGroup="xbrli:item" />
  <element name="ZeroCouponBondStepUpsAndPaymentInKindSecuritiesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_ZeroCouponBondStepUpsAndPaymentInKindSecuritiesRiskMember" substitutionGroup="xbrli:item" />
  <element name="AssetAllocationRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_AssetAllocationRiskMember" substitutionGroup="xbrli:item" />
  <element name="AutonomouselectricVehicleRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_AutonomouselectricVehicleRiskMember" substitutionGroup="xbrli:item" />
  <element name="CallRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_CallRiskMember" substitutionGroup="xbrli:item" />
  <element name="CertainAffiliationsMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_CertainAffiliationsMember" substitutionGroup="xbrli:item" />
  <element name="CollateralizedBondObligationsCollateralizedLoanObligationsAndCollateralizedDebtObligationsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_CollateralizedBondObligationsCollateralizedLoanObligationsAndCollateralizedDebtObligationsRiskMember" substitutionGroup="xbrli:item" />
  <element name="CommoditiesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_CommoditiesRiskMember" substitutionGroup="xbrli:item" />
  <element name="ConfidentialInformationAccessRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_ConfidentialInformationAccessRiskMember" substitutionGroup="xbrli:item" />
  <element name="ContingentConvertibleSecuritiesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_ContingentConvertibleSecuritiesRiskMember" substitutionGroup="xbrli:item" />
  <element name="ConvertibleSecuritiesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_ConvertibleSecuritiesRiskMember" substitutionGroup="xbrli:item" />
  <element name="CorporateDebtSecuritiesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_CorporateDebtSecuritiesRiskMember" substitutionGroup="xbrli:item" />
  <element name="CounterpartyRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_CounterpartyRiskMember" substitutionGroup="xbrli:item" />
  <element name="CovenantLiteObligationsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_CovenantLiteObligationsRiskMember" substitutionGroup="xbrli:item" />
  <element name="CreditDefaultSwapsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_CreditDefaultSwapsRiskMember" substitutionGroup="xbrli:item" />
  <element name="CreditRisksMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_CreditRisksMember" substitutionGroup="xbrli:item" />
  <element name="CsdrRelatedRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_CsdrRelatedRiskMember" substitutionGroup="xbrli:item" />
  <element name="CurrencyRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_CurrencyRiskMember" substitutionGroup="xbrli:item" />
  <element name="CyberSecurityRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_CyberSecurityRiskMember" substitutionGroup="xbrli:item" />
  <element name="DebtSecuritiesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_DebtSecuritiesRiskMember" substitutionGroup="xbrli:item" />
  <element name="DerivativesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_DerivativesRiskMember" substitutionGroup="xbrli:item" />
  <element name="DistressedAndDefaultedSecuritiesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_DistressedAndDefaultedSecuritiesRiskMember" substitutionGroup="xbrli:item" />
  <element name="DistributionRateRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_DistributionRateRiskMember" substitutionGroup="xbrli:item" />
  <element name="EmergingMarketsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_EmergingMarketsRiskMember" substitutionGroup="xbrli:item" />
  <element name="EnergySectorRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_EnergySectorRiskMember" substitutionGroup="xbrli:item" />
  <element name="EquitySecuritiesAndRelatedMarketRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_EquitySecuritiesAndRelatedMarketRiskMember" substitutionGroup="xbrli:item" />
  <element name="FocusedInvestmentRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_FocusedInvestmentRiskMember" substitutionGroup="xbrli:item" />
  <element name="ForeignLoanOriginationsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_ForeignLoanOriginationsRiskMember" substitutionGroup="xbrli:item" />
  <element name="ForeignNonUSGovernmentSecuritiesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_ForeignNonUSGovernmentSecuritiesRiskMember" substitutionGroup="xbrli:item" />
  <element name="ForeignNonUsInvestmentRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_ForeignNonUsInvestmentRiskMember" substitutionGroup="xbrli:item" />
  <element name="HighYieldSecuritiesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_HighYieldSecuritiesRiskMember" substitutionGroup="xbrli:item" />
  <element name="IndustrySpecificRisksMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_IndustrySpecificRisksMember" substitutionGroup="xbrli:item" />
  <element name="InflationdeflationRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_InflationdeflationRiskMember" substitutionGroup="xbrli:item" />
  <element name="InflationindexedSecurityRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_InflationindexedSecurityRiskMember" substitutionGroup="xbrli:item" />
  <element name="InsurancelinkedAndOtherInstrumentsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_InsurancelinkedAndOtherInstrumentsRiskMember" substitutionGroup="xbrli:item" />
  <element name="InterestRateRisk1Member" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_InterestRateRisk1Member" substitutionGroup="xbrli:item" />
  <element name="IssuerRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_IssuerRiskMember" substitutionGroup="xbrli:item" />
  <element name="LeverageRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_LeverageRiskMember" substitutionGroup="xbrli:item" />
  <element name="LimitedTermRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_LimitedTermRiskMember" substitutionGroup="xbrli:item" />
  <element name="LiquidityRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_LiquidityRiskMember" substitutionGroup="xbrli:item" />
  <element name="LoanOriginationRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_LoanOriginationRiskMember" substitutionGroup="xbrli:item" />
  <element name="LoansAndOtherIndebtednessLoanAcquisitionsParticipationsAndAssignmentsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_LoansAndOtherIndebtednessLoanAcquisitionsParticipationsAndAssignmentsRiskMember" substitutionGroup="xbrli:item" />
  <element name="ManagementRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_ManagementRiskMember" substitutionGroup="xbrli:item" />
  <element name="MarketDiscountRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_MarketDiscountRiskMember" substitutionGroup="xbrli:item" />
  <element name="MarketDisruptionsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_MarketDisruptionsRiskMember" substitutionGroup="xbrli:item" />
  <element name="MarketRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_MarketRiskMember" substitutionGroup="xbrli:item" />
  <element name="MortgagerelatedAndOtherAssetbackedInstrumentsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_MortgagerelatedAndOtherAssetbackedInstrumentsRiskMember" substitutionGroup="xbrli:item" />
  <element name="MortgagerelatedDerivativeInstrumentsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_MortgagerelatedDerivativeInstrumentsRiskMember" substitutionGroup="xbrli:item" />
  <element name="MunicipalBondRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_MunicipalBondRiskMember" substitutionGroup="xbrli:item" />
  <element name="NonDiversificationRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_NonDiversificationRiskMember" substitutionGroup="xbrli:item" />
  <element name="OperationalRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_OperationalRiskMember" substitutionGroup="xbrli:item" />
  <element name="OtherInvestmentCompaniesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_OtherInvestmentCompaniesRiskMember" substitutionGroup="xbrli:item" />
  <element name="OtherPooledInvestmentVehiclesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_OtherPooledInvestmentVehiclesRiskMember" substitutionGroup="xbrli:item" />
  <element name="PlatformRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_PlatformRiskMember" substitutionGroup="xbrli:item" />
  <element name="PortfolioTurnoverRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_PortfolioTurnoverRiskMember" substitutionGroup="xbrli:item" />
  <element name="PotentialConflictsOfInterestRiskAllocationOfInvestmentOpportunitiesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_PotentialConflictsOfInterestRiskAllocationOfInvestmentOpportunitiesMember" substitutionGroup="xbrli:item" />
  <element name="PreferredSecuritiesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_PreferredSecuritiesRiskMember" substitutionGroup="xbrli:item" />
  <element name="PrepaymentsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_PrepaymentsRiskMember" substitutionGroup="xbrli:item" />
  <element name="PrivacyAndDataSecurityRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_PrivacyAndDataSecurityRiskMember" substitutionGroup="xbrli:item" />
  <element name="PrivateFundsRiskTaxRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_PrivateFundsRiskTaxRiskMember" substitutionGroup="xbrli:item" />
  <element name="PrivatelyIssuedMortgageRelatedSecuritiesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_PrivatelyIssuedMortgageRelatedSecuritiesRiskMember" substitutionGroup="xbrli:item" />
  <element name="PrivatePlacementsAndRestrictedSecuritiesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_PrivatePlacementsAndRestrictedSecuritiesRiskMember" substitutionGroup="xbrli:item" />
  <element name="PrivateRealEstateInvestmentsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_PrivateRealEstateInvestmentsRiskMember" substitutionGroup="xbrli:item" />
  <element name="RealEstateRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_RealEstateRiskMember" substitutionGroup="xbrli:item" />
  <element name="RegulationSSecuritiesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_RegulationSSecuritiesRiskMember" substitutionGroup="xbrli:item" />
  <element name="RegulatoryChangesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_RegulatoryChangesRiskMember" substitutionGroup="xbrli:item" />
  <element name="RegulatoryRiskCommodityPoolOperatorMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_RegulatoryRiskCommodityPoolOperatorMember" substitutionGroup="xbrli:item" />
  <element name="ReinvestmentRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_ReinvestmentRiskMember" substitutionGroup="xbrli:item" />
  <element name="ReitRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_ReitRiskMember" substitutionGroup="xbrli:item" />
  <element name="RepurchaseAgreementsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_RepurchaseAgreementsRiskMember" substitutionGroup="xbrli:item" />
  <element name="RiskOfInvestingInChinaMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_RiskOfInvestingInChinaMember" substitutionGroup="xbrli:item" />
  <element name="RiskRetentionInvestmentRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_RiskRetentionInvestmentRiskMember" substitutionGroup="xbrli:item" />
  <element name="RisksOfDebtSecuritiesOfMLPsMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_RisksOfDebtSecuritiesOfMLPsMember" substitutionGroup="xbrli:item" />
  <element name="RisksOfEquitySecuritiesOfMLPsMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_RisksOfEquitySecuritiesOfMLPsMember" substitutionGroup="xbrli:item" />
  <element name="RisksOfETNsMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_RisksOfETNsMember" substitutionGroup="xbrli:item" />
  <element name="SecuritiesLendingRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_SecuritiesLendingRiskMember" substitutionGroup="xbrli:item" />
  <element name="SeniorDebtRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_SeniorDebtRiskMember" substitutionGroup="xbrli:item" />
  <element name="ShortExposureRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_ShortExposureRiskMember" substitutionGroup="xbrli:item" />
  <element name="SmallerCompanyRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_SmallerCompanyRiskMember" substitutionGroup="xbrli:item" />
  <element name="SovereignDebtRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_SovereignDebtRiskMember" substitutionGroup="xbrli:item" />
  <element name="SpecialPurposeAcquisitionCompaniesSpacsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_SpecialPurposeAcquisitionCompaniesSpacsRiskMember" substitutionGroup="xbrli:item" />
  <element name="StructuredInvestmentsRisMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_StructuredInvestmentsRisMember" substitutionGroup="xbrli:item" />
  <element name="CommonSharesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="cik0001318025_CommonSharesMember" substitutionGroup="xbrli:item" />
</schema>
