Comparison between the Herschel SPIRE 350 μm flux density and the Planck 857 GHz flux density for the 82 PCCS sources with a clear counterpart. The different panels correspond to four different methods used in the PCCS to measure flux densities. The solid green line represents a linear regression fit to the data, the solid blue line corresponds to a one-to-one correlation. The GAUFLUX panel only contains 53 sources as this flux density estimate is not provided for all sources in the PCCS.