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Fig. 3.


Each row shows the I, QIPS and UIPS images (from left to right) for polarimetric cycles with increasing parallactic angle from top to bottom. The on-sky orientation is the same for all panels: north is up, and east is left. However, the measured polarization angle (Eq. (4)) changes with derotator angle (θder), which is visible in the rotation of the butterfly pattern in clockwise direction. Furthermore, the polarimetric efficiency decreases with θder further removed from 180°, which is visible by the decreasing signal-to-noise ratio in the QIPS and UIPS images.

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