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Position Angle Correction, CPA

The waveplate is not achromatic, hence the polarization position angle correction (CPA) is wavelength dependent. From broad band imaging polarimetry the CPA is determined as:

PA U PA B PA V PA R PA I Date Star
-3.8 -6.1 -2.8 +0.3 +1.9 11/12-2010 BD+59 389

The numbers are average from three nights (except U-band one night)
and typical position angle accuracy is better than 0.4 degrees
(except U-band about 0.8 degrees).

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