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   Computes the value of the burner temperature given the throttle ratio
   and the burner value at sea level static conditions.
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   Form:
   pT = PressureTotal( p, gamma, machNo )
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   Inputs
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   tT4SLS          (1,1)   Burner temperature at sea level static
   throttleRatio   (1,1)   Throttle ratio

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   Outputs
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   tT4             (1,1)   Burner temperature

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