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polconst: Constant polarization

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)