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Use the functional form specified by Function(R) for the rotation velocity as a function of Radius. The default is the Keplerian law KEPLER_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 "distance" KEPLER_DIST to 1 pc, so that the radii R are then just in arcsecond.