Fig. 1
Total counts per second in the frames for the polarimetric observations of April 2015 illustrating the impact of clouds on the data. Essentially only frames with count rates above 1 × 106 (green line) were used in the data reduction. The dashed lines mark the maximum counts per frame 1.14 × 107 and the mean counts 8.6 × 106 for the frames considered in the data analysis.
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