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   Generates a color corresponding to a temperature.
   colorMap is optional.
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   Form:
   rGB = ThermalColorcolorMap( temp, tempMax, colorMap )
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   ------
   Inputs
   ------
   temp           (1,n)       Temperatures
   tempMax        (1,1)       Maximum temperature
   colorMap       (:,3)       Color colorMap. Each row is [r b g]

   -------
   Outputs
   -------
   rGB            (n,3)       Colors representing the temperature.

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