Seven steps of initial estimation of the position of a centroid for three sample subrasters. From left to right: (1) master dark frame, (2) mask of bad pixels (thresholded master dark frame), (3) raw subraster, (4) subraster after subtracting median column offset (first iteration), (5) the same subraster after median filtering (first iteration), (6) final stellar mask, (7) Icol subraster (see text) with the position of the centroid marked by a red dot.
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