# 4.1.36. Vblo: rectangular velocity broadening model¶

This multiplicative model broadens an arbitrary additive component with a rectangular Doppler profile, characterized by the half-width . Therefore if a delta-line at energy is convolved with this component, its full energy width will be , and line photons get a rectangular distribution between and . Of course, any line or continuum emission component can be convolved with the this broadening model.

The parameters of the model are:

`vblo`

: Velocity broadening half-width , in km/s. Default
value: 3000 km/s.