scaling relation (Eq. (12) with the slope fixed to 1) for the ITP (left panel) and SDSS (right panel) samples. Red and green dots represent the SDSS clusters included in and excluded from the PlCS, respectively. Red, green, and blue lines are the best fit for the SDSS cosmo, the SDSS not cosmo, and the whole SDSS sample, respectively, whereas the dotted line is the 1 : 1 relation. The ITP and the SDSS fits are at 2.6 − σ. This difference between these fits suggests a possible Eddington bias contamination.x