Top: distribution of the size ratio [Size(10²² cm^-2)/Size(3 × 10²¹ cm^-2)] as a function of the mass ratio [Mass(10²² cm^-2)/Mass(3 × 10²¹ cm^-2)] for two different column density thresholds: 3 × 10²¹ cm^-2 and 10²² cm^-2. Bottom: distribution of the mass ratio as a function of the Galactocentric distance. On both plots, red and black symbols indicate the clumps from Category I and II, respectively. Plus signs indicate the clumps in the outer part of the Galaxy and diamonds indicate the sources in the inner Galaxy.