Growth curve analysis of galaxy cluster XLSSC 010 at z = 0.33. The 60′′ aperture flux of this cluster is close to the median value in the bright XXL cluster sample. Left: source masking is shown by the black lines. The two dashed pink circles delimit the annulus used for the background estimate. The cluster selection was made from the integrated [0.5–2] keV count rate measured within a radius of 60′′ (blue line). Right: growth curve of XLSSC 010. The grey area represents the 1σ confidence interval. The dotted lines show the 60′′ extraction radius (vertical line) and the corresponding 1σ interval for the aperture count rate (horizontal lines). The dashed vertical lines indicate the radial range within which the background was estimated.