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   A/A* computation from mach number and ratio of specific heats.
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   Form:
   a = AOverAStar( gamma, machNo )
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   Inputs
   ------
   gamma      (1,1)   Ratio of specific heats
   machNo     (1,:)   Mach number

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   Outputs
   -------
   a          (1,:)   A/A*

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