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There was an error with the unit for the gasfvf function, unit should be reservoir cubic feet per standard cubic feet, not reservoir barrels.
Also, I merged both functions into one as I think its better for interfacing with users of the function. With respect to interfacing with users, I think it will be better to use strings that reservoir engineers are familiar with as the unit parameters.
Lastly, I added a form of validation to check for errors in unit input.