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polrot: Rotate polarization

This mixing model rotates the polarization assuming at least two spectra, for the Q and U Stokes parameters.

$\displaystyle Q_{new} = Q\times cos(2\theta) - U\times sin(2\theta)$
$\displaystyle U_{new} = Q\times sin(2\theta) + U\times cos(2\theta)$

Which spectrum is from which Stokes parameter is determined using an XFLTnnnn keyword with values “Stokes:0”, “Stokes:1”, or “Stokes:2”, for I, Q, U, respectively.

Any spectra other than Q or U included in the fit will be unchanged. Any datagroup containing one of Q or U must contain the other and there should only be one pair of Q and U per datagroup.

The parameters are :

par1 theta, the polarization rotation angle (degrees)