LoadGEM

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   Load the GEMT1 data.
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   Form:
   [sO, c, j, mu, a] = LoadGEM( unNorm )
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   ------
   Inputs
   ------
   unNorm           If any input here generate unnormalized coefficients

   -------
   Outputs
   -------
   s0       (36,36) S terms  s(n,m) where n and m are degree and order of the model.
   c        (36,36) C terms  c(n,m)
   j        (36)    m = 0 terms
   mu               Spherical gravitational potential
   a                Earth radius

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   Reference: Seidelmann, P.K, (ed) (1992). Explanatory Supplement to the
              Astronomical Almanac. University Science Books, Mill Valley, CA.
              pp. 227-233.
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