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   Converts eccentric anomaly to mean anomaly.
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   Form:
   meanAnom = E2M( ecc, eccAnom )
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   ------
   Inputs
   ------
   ecc       (1,:) Eccentricity
   eccAnom   (1,:) Eccentric anomaly

   -------
   Outputs
   -------
   meanAnom  (1,:) Mean anomaly

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   References:	Bate, R. R. Fundamentals of Astrodynamics. pp. 185-187.
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