KEPLER /VELOCITY
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KEPLER /VELOCITY

            [BUNDLES\]KEPLER [/VSYSTEM Value]  /VELOCITY R Function(R)

          Use  the functional form specified by Function(R) for the rotation ve-
        locity as a function of Radius. The default is  the  Keplerian  law  KE-
        PLER_VMASS*sqrt(R/100).

          Note:  This  can  allow  to  use the KEPLER command to handle rotation
        curves for galaxies, for example. However, the choice of radial units is
        not  obvious  in  this  case. It can be made simple by setting the "dis-
        tance" KEPLER_DIST to 1 pc, so that the radii R are then just in arcsec-
        ond.