S* = Underlying asset price in foreign currency.
X* = Delivery price in foreign currency.
r = Domestic risk free rate.
rf = Foreign risk free rate.
q = Instantaneous proportional dividend payout rate of the underlying asset.
E = Spot exchange rate in units of domestic currency per unit of foreign currency.
E* = Spot exchange rate in units of the foreign currency per unit of domestic currency.
= Volatility of the underlying asset.
= Volatility of the domestic exchange rate.
= Correlation between asset and the domestic exchange rate.
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