Classification of images based on the value of As. The upper plot shows As for 73 500 consecutive measurements of HD 127973 (η Cen) in the Centaurus field. The two horizontal lines denote the two cut-off thresholds. The four images shown below were classified as (from left to right): useful image (As = 79 pix), dark image (As = 0 pix), image with stellar profile at the edge of the subraster (As = 41 pix), and blurred image (As = 85 pix).
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