4.1.37. Vgau: gaussian velocity broadening model

This multiplicative model broadens an arbitrary additive component with a Gaussian Doppler profile, characterized by the Gaussian \sigma. The broadening kernel is therefore proportional to e^{\displaystyle{-(c^2/2\sigma^2)(E-E_0)^2/E_0^2}}.

The parameters of the model are:

sig : Gaussian velocity broadening \sigma, in km/s. Default value: 1 km/s