Top: distribution of the validated sources from the PCCS2. Red, blue, and green circles show sources from the 30, 143, and 857 GHz catalogues, respectively. Bottom: locations of the sources in the 143 and 857 PCCS2E, shown by blue and green circles, respectively. The figure is a full-sky Mollweide projection with the Galactic equator horizontal; longitude increases to the left with the Galactic centre in the centre of the map. The size of the filled circles gives an idea of the relative flux densities of the sources per frequency, where the larger circles correspond to larger flux densities. Note that a different size range for each channel was necessary for visualization purposes.