Scaling relation (fit of Eq. (12) with a fixed slope equal to 1) after correction for Eddington bias. Magenta, red, yellow, and green dots represent the clusters within the four S/N bins: S/N < 4.82, 4.82 ≤ S/N < 5.47, 5.47 ≤ S/N < 6.84, and S/N ≥ 6.84, respectively. After correcting for the Eddington bias, performed following the prescriptions by van der Burg et al. (2016), the best fits within the S/N bins (green, red, magenta, and yellow lines) are now compatible within 1.9 − σ at most with each other and with respect to the best fit of our whole sample (blue line). The dotted line represents the 1:1 relation.