This multiplicative model applies a constant polarization. The factor applied depends on which Stokes parameter the spectrum is for. The Stokes parameter is determined using an XFLTnnnn keyword with values ``Stokes:0'', ``Stokes:1'', or ``Stokes:2'', for I, Q, U, respectively.
The parameters are :
| par1 | A, the polarization fraction |
| par2 | psi, the polarization angle (degrees) |