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Condensed Schedule of Investments
Sep. 30, 2017
USD ($)
Contracts
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (18,634,130)
Open Futures Contracts, Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG November 2017 contracts, expiring October 2017  
Notional Amount $ 386,459,240
Number of Contracts | Contracts 12,423
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (12,899,630)
% of Partners' Capital (2.46%)
Open Futures Contracts, Long [Member] | United States [Member] | ICE Natural Gas Futures LD1 H November 2017 contracts, expiring November 2017  
Notional Amount $ 156,084,500
Number of Contracts | Contracts 20,000
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (5,734,500)
% of Partners' Capital (1.10%)
Total Open Futures Contracts [Member] | Open Futures Contracts, Long [Member] | United States [Member]  
Notional Amount $ 542,543,740 [1]
Number of Contracts | Contracts 32,423 [1]
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (18,634,130) [1]
% of Partners' Capital (3.56%) [1]
Cash Equivalents [Member] | United States [Member]  
Market Value $ 413,969,910
% of Partners' Capital 79.02%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member]  
Market Value $ 393,969,910
% of Partners' Capital 75.20%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 0.90%, 10/05/2017 [Member]  
Principal Amount $ 15,000,000
Market Value $ 14,998,508
% of Partners' Capital 2.86%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 0.92%, 10/12/2017 [Member]  
Principal Amount $ 20,000,000
Market Value $ 19,994,408
% of Partners' Capital 3.82%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 0.91%, 10/19/2017 [Member]  
Principal Amount $ 20,000,000
Market Value $ 19,990,950
% of Partners' Capital 3.82%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 0.95%, 10/26/2017 [Member]  
Principal Amount $ 10,000,000
Market Value $ 9,993,403
% of Partners' Capital 1.91%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 0.97%, 11/02/2017 [Member]  
Principal Amount $ 15,000,000
Market Value $ 14,987,133
% of Partners' Capital 2.86%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.01%, 11/09/2017 [Member]  
Principal Amount $ 15,000,000
Market Value $ 14,983,669
% of Partners' Capital 2.86%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 0.98%, 11/16/2017 [Member]  
Principal Amount $ 20,000,000
Market Value $ 19,974,956
% of Partners' Capital 3.81%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.05%, 11/24/2017 [Member]  
Principal Amount $ 20,000,000
Market Value $ 19,968,650
% of Partners' Capital 3.81%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.05%, 11/30/2017 [Member]  
Principal Amount $ 20,000,000
Market Value $ 19,965,167
% of Partners' Capital 3.81%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.08%, 12/07/2017 [Member]  
Principal Amount $ 15,000,000
Market Value $ 14,970,129
% of Partners' Capital 2.86%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.09%, 12/14/2017 [Member]  
Principal Amount $ 20,000,000
Market Value $ 19,955,600
% of Partners' Capital 3.81%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.11%, 12/21/2017 [Member]  
Principal Amount $ 20,000,000
Market Value $ 19,950,500
% of Partners' Capital 3.81%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.10%, 12/28/2017 [Member]  
Principal Amount $ 20,000,000
Market Value $ 19,946,467
% of Partners' Capital 3.81%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.12%, 1/04/2018 [Member]  
Principal Amount $ 10,000,000
Market Value $ 9,970,576
% of Partners' Capital 1.90%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.11%, 1/11/2018 [Member]  
Principal Amount $ 15,000,000
Market Value $ 14,953,038
% of Partners' Capital 2.85%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.10%, 1/18/2018 [Member]  
Principal Amount $ 15,000,000
Market Value $ 14,950,496
% of Partners' Capital 2.85%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.12%, 1/25/2018 [Member]  
Principal Amount $ 10,000,000
Market Value $ 9,964,072
% of Partners' Capital 1.90%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.12%, 2/01/2018 [Member]  
Principal Amount $ 10,000,000
Market Value $ 9,961,904
% of Partners' Capital 1.90%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.13%, 2/08/2018 [Member]  
Principal Amount $ 10,000,000
Market Value $ 9,959,375
% of Partners' Capital 1.90%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.12%, 2/15/2018[Member]  
Principal Amount $ 10,000,000
Market Value $ 9,957,758
% of Partners' Capital 1.90%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.10%, 2/22/2018 [Member]  
Principal Amount $ 15,000,000
Market Value $ 14,934,600
% of Partners' Capital 2.85%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.09%, 3/01/2018 [Member]  
Principal Amount $ 20,000,000
Market Value $ 19,908,981
% of Partners' Capital 3.80%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.14%, 3/08/2018 [Member]  
Principal Amount $ 10,000,000
Market Value $ 9,950,296
% of Partners' Capital 1.90%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.14%, 3/15/2018 [Member]  
Principal Amount $ 10,000,000
Market Value $ 9,948,208
% of Partners' Capital 1.90%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | Us Treasury Bills 1.16%, 3/22/2018 [Member]  
Principal Amount $ 15,000,000
Market Value $ 14,917,583
% of Partners' Capital 2.85%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.17%, 3/29/2018 [Member]  
Principal Amount $ 15,000,000
Market Value $ 14,913,483
% of Partners' Capital 2.85%
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member]  
Market Value $ 20,000,000
% of Partners' Capital 3.82%
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | Fidelity Investments Money Market Funds - Government Portfolio [Member]  
Principal Amount $ 10,000,000
Market Value $ 10,000,000
% of Partners' Capital 1.91%
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member]  
Principal Amount $ 10,000,000
Market Value $ 10,000,000
% of Partners' Capital 1.91%
[1] Collateral amounted to $88,881,582 on open futures contracts.