Comparison between the Metsähovi and the colour-corrected PCCS flux densities (DETFLUX) interpolated to 37 GHz using 30 and 44 GHz Planck data (left) and 30 and 70 GHz data (right). The multiple observations of each source have been averaged to a single flux density and therefore the uncertainties reflect the variability of the sources instead of the actual flux density accuracy of the measurements (a few mJy).