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   Generate a grid on a sphere that is evenly spaced in right ascension
   and elevation.
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   Form:
   [rA, dec, kDec] = SphericalGrid( n )
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   Inputs
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   n          (1,1)   Number of right ascensions

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   Outputs
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   rA         (1,m)   Right ascension
   dec        (1,m)   Declination
   kDec       (1,n)   The first element in rA and dec for each
                      new declination.

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