Colour−colour plots. Red crosses represent sources from the PCCS2 and blue diamonds sources from the PCCS2E. Top: common frequency 217 GHz. We can see the non-thermal and thermal source populations of the PCCS2; the PCCS2E contains significantly more thermal sources than the PCCS2, as expected given the that PCCS2E contains the Galactic plane region. Bottom: common frequency 857 GHz. The PCCS2 is consistent with a population of cold sources spanning a narrow range in temperature, whereas the PCCS2E shows a wider distribution of source properties.
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