Median telescope polarisation for α Cen A from 2017 inN_R-band measured for both Stokes parameters – Q and U – as a function of the telescope parallactic angle θpar. The plots show the measurements for camera 1 (+) and camera 2 (◇). The measurements have been fit with a model function (solid lines) resulting in a measurement of the telescope polarisation amplitude ptel and phase δtel for both cameras.
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