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   Temperature of a sphere.
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   Form:
   T = TempSph( alpha, epsilon, S )
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   ------
   Inputs
   ------
   alpha         (1,1)  Absorptivity
   epsilon       (1,1)  Emissivity
   S             (1,1)  Heat flux (watts)

   -------
   Outputs
   -------
   T                    Temperature (deg-K)

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