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vmshift: velocity shift a multiplicative model

This convolution model velocity shifts a multiplicative model. It takes the calculated model and shifts energies by $-Ev/c$.

The energies command must be to used to extend the energy range over which the model is being calculated.

The parameter is:

par1=$v$ velocity (km/s)

An example model use is: 

XSPEC>model phabs*(vmshift*phabs)*pow
which multiplies the power-law by both a velocity shifted and local absorption.