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   Computes the ratio of specific heats of a gas mixture.
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   Form:
   [gammaM, nM] = Gamma( cP, n )
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   Inputs
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   cP            (:)     Specific heats of the constituents (cal/mole deg K)
   n             (:)     Number of moles of each constituent

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   Outputs
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   gammaM        (:)     Ratio of specific heat of the mixture (cal/mole deg K)
   nM            (:)     Number of moles in the mixture

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