The mass-size relation for a cold and a warm ATLASGAL subsample (see Sect. 7.5) is shown as a red and black contour plot in the top panel, bins of 0.25 are used for the logarithm of the effective radius and bins of 0.2 for the logarithm of the gas mass. The scatter plot with the cold subsample as red triangles and the warm sources as black points is displayed in the middle panel. Mean values of the logarithm of the gas masses and of the effective radii are plotted in the bottom panel. The lines are the same as described in Sect. 7.5.