Normalized cumulative gas mass versus entropy for 12 CC systems extracted from the ACCEPT sample. For all these systems the minimum entropy is smaller than 30 keV cm². The gas mass is normalized to the total gas mass. The dashed vertical line corresponds to K = 30 keV cm². Note that only CC objects are expected to have mass distributions extending below this entropy. There are a few systems, i.e. A4059,A2199 and A2029, that have less than 1% of their gas mass with K <  30 keV cm² and which do not cross the threshold within the boundaries of this plot.