Path: Orbit/OrbitCoord
% Computes the orbit velocity in the perifocal plane.
   Since version 1.
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   Form:
   vPQ = VPQ( e, p, nu, mu )
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   ------
   Inputs
   ------
   e                     Eccentricity
   p                     The parameter
   nu              (:)   True anomaly (rad)
   mu                    Gravitational parameter
   -------
   Outputs
   -------
   vPQ             (3,:) Velocity
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   References:	 Wiesel, W. E., Spaceflight Dynamics, McGraw-Hill, 1988,
                pp. 63-64.
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Common: Graphics/Plot2D
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