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##

vashift: velocity shift an additive model

This convolution model velocity shifts an additive model. It takes the calculated
model and shifts energies .

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

The parameter is:

par1= |
velocity (km/s) |

An example model use is:

XSPEC>model phabs*vashift*(pow+ga)

which velocity shifts the power-law and gaussian then multiplies by local absorption.