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   Ram recovery in an inlet. This computes the loss of pressure due to
   shocks. It is based on Military Specification 5008B.
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   Form:
   etaR = RamRecovery( machNo )
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   Inputs
   ------
   machNo     (1,:)   Mach number

   -------
   Outputs
   -------
   etaR       (1,:)   Ram recovery

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