Corrected Gas Gravity -- Vasquez & Beggs
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Gamma_gc = Gamma_g*(1 + 5.912*10**(-5)*Gamma_API*Ts*log(ps/114.7))
Gamma_gc = Corrected gas gravity,
ps = separator pressure, psia
Gamma_g = gas gravity (air=1.0),
Ts = Separator temperature, F, and
Gamma_API = stock-tank oil gravity, API.
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