Example of the BCG in the cluster Abell 2261, at z = 0.224. Left: segmentation map returned by SExtractor, with the BCG unmasked. The pixels with a value of 1 are masked; those with a value of 0 are unmasked. Middle: sharp divided image in which four knots in the core appear. These knots were drowned in the light of the BCG and are now visible. Right: final mask (including the central objects).
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