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Condensed Schedule of Investments
Mar. 31, 2022
USD ($)
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 54,076,930
Money Market Funds [Member]  
Market Value $ 303,000,000
% of Partners' Capital 78.17%
Open Commodity Futures Contracts, Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG May 2022 contracts, expiring April 2022*  
Notional Amount $ 333,528,470 [1]
Number of Contracts 6,870 [1]
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 54,076,930 [1]
% of Partners' Capital 13.95% [1]
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | Goldman Sachs Financial Square Government Fund Institutional Shares [Member]  
Shares/Principal Amount $ 171,000,000 [2]
Market Value $ 171,000,000 [2]
% of Partners' Capital 44.12% [2]
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | Morgan Stanley Institutional Liquidity Funds Government Portfolio Institutional Shares [Member]  
Shares/Principal Amount $ 100,000,000
Market Value $ 100,000,000
% of Partners' Capital 25.80%
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | RBC U.S. Government Money Market Fund - Institutional Share Class [Member]  
Shares/Principal Amount $ 32,000,000
Market Value $ 32,000,000
% of Partners' Capital 8.25%
[1] *    Collateral amounted to $50,000,000 on open commodity futures contracts.
[2] #    Reflects the 7-day yield at March 31, 2022.