Mass-redshift distribution of the Planck cosmological samples colour-coded by their signal-to-noise, q. The baseline MMF3 2015 cosmological sample is shown as the small filled circles. Objects which were in the MMF3 2013 cosmological sample are marked by crosses, while those in the 2015 intersection sample are shown as open circles. The final samples are defined by q> 6. The mass M_Yz is the Planck mass proxy (see text; Arnaud et al., in prep.).