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Figure 5
The six patterns represent a downsampled (8×8) average over 2932 frames (first and second row) and over 605 frames (third row). Each row contains frames corrected on a per-ASIC basis (first column) and per-column per-ASIC basis (second column). The first row is representative of the sample runs, where a normalized expected background is subtracted from each frame used for the average; pixels with too high photon counts have been masked out. The second row is the average of the normalized expected background, whereas the last row corresponds to dark run frames. A strong artifact is clearly shown both in the dark data and in the sample runs (band in the right CSPAD 2×1 module in the left images) along with its correction (the respective on the right). The latter is quite striking in the case of dark frames. Data used here come from L730 beam time, specifically runs 399, 410, 423 (sample and expected background) and 398 (dark).

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