Comparison of simultaneous colour-corrected flux density measurements by Planck and the VLA at 28.45 GHz (top) and Planck and the VLA (dots) or ATCA (open squares) 43.34 GHz (bottom). The best fit line is shown in red. The Planck 44 GHz channel is noisier than the 30 GHz channel and shows Eddington bias at low flux densities. Some sources have larger error bars than others because they lie close to the Galactic plane where the uncertainties in the measured flux densities can be large. The tiny VLA error bars have not been plotted.
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