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Condensed Schedule of Investments
Sep. 30, 2020
USD ($)
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (18,653,136)
Money Market Funds [Member]  
Market Value $ 21,143,000
% of Partners' Capital 6.68%
Money Market Funds [Member] | Fidelity Investments Money Market Funds Government Portfolio [Member]  
Shares/Principal Amount $ 1,103,000 [1]
Market Value $ 1,103,000 [1]
% of Partners' Capital 0.35% [1]
Money Market Funds [Member] | Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member]  
Shares/Principal Amount $ 10,022,000 [1]
Market Value $ 10,022,000 [1]
% of Partners' Capital 3.17% [1]
Open Commodity Futures Contracts, Long [Member] | United States Contracts | Nymex Natural Gas Future NG November 2020 Contracts Expiring October 2020 Member  
Notional Amount $ 335,185,156 [2]
Number of Contracts 12,526 [2]
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (18,653,136) [2]
% of Partners' Capital (5.89%) [2]
Cash Equivalents [Member] | United States Contracts | Money Market Funds [Member] | RBC U.S. Government Money Market Fund - Institutional Share Class [Member]  
Shares/Principal Amount $ 10,018,000 [1]
Market Value $ 10,018,000 [1]
% of Partners' Capital 3.16% [1]
[1] Reflects the 7-day yield at September 30, 2020.
[2] Collateral amounted to $61,501,809 on open commodity futures contracts.