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   Total pressure.
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   Form:
   tT = TemperatureTotal( t, gamma, machNo )
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   ------
   Inputs
   ------
   t          (1,1)   Temperature
   gamma      (1,1)   Ratio of specific heats
   machNo     (1,:)   Mach number

   -------
   Outputs
   -------
   tT          (1,:)  Total pressure

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