For 45 clusters in common between our sample and the Planck sample (see Sect. 6 for details), the blue crosses show the mass estimates from PXX as a function of the masses we derive from their X-ray temperature and our T_X − M scaling relation in our fiducial case, with A_TM = 6.29 (best-fit value). The red line corresponds to the best fit from the BCES regression technique, and its slope gives us the mass bias of the Planck masses (see text for the detail).