Fit of the scaling relation in Eq. (12) (with the slope fixed to 1) for the whole sample ITP+SDSS (blue line). Green, red, magenta, and yellow dots and lines represents the clusters within the four S/N bins: S/N < 4.81, 4.81 ≤ S/N < 5.47, 5.47 ≤ S/N < 6.83, and S/N ≥ 6.83 and their best fits, respectively. These fits are only marginally compatible within a maximum difference of 2.9 − σ. The dotted line represents the 1:1 relation.