The payoff of this option is: $$ \begin{eqnarray*} max\left(Q_1S_1 - Q_2S_2, 0\right) \end{eqnarray*} $$ where $Q_1$ is the quantity of the first asset, $S_1$ is the spot price of the first underlying, $Q_2$ is the quantity of the second asset and $S_2$ is the spot price of the second underlying.
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