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Row mean of the residuals of pre-correlations as a function of the row number for the virtual images of the calibration phase. Triplets of a 1, 2 and 3 revealing a line shift in image 1, approximately at y = − 50 px and b 4, 5 and 6 revealing a line shift in image 4, approximately at y = 50 px. Note that the residual fields are available only in the region of interest
