galpy.potential.Potential.dens
galpy.potential.Potential.epifreq
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NAME:
dvcircdR
PURPOSE:
calculate the derivative of the circular velocity at R wrt R in this potential
INPUT:
R - Galactocentric radius
OUTPUT:
derivative of the circular rotation velocity wrt R
HISTORY:
2013-01-08 - Written - Bovy (IAS)