M₅₀₀ estimated from the joint detection for the candidates matching a confirmed cluster vs. the published M₅₀₀ of the corresponding cluster. Panel a: comparison of the estimated mass to the published SZ mass for the 155 candidates matching an SZ cluster with known mass. Panel b: comparison of the estimated mass to the published MCXC mass for the 72 candidates matching an MCXC cluster. The dotted red line indicates the line of zero intercept and unity slope. The solid blue line indicates the median ratio. The dashed blue lines indicate the interval of ± 2.5σ around the median ratio. Outliers are highlighted with a blue (high estimated mass) or red (low estimated mass) square; see text. Green crosses indicate SPT clusters that are not in Planck catalogues and cyan crosses indicate MCXC clusters that are notin Planck or SPT.