Statistics of core MST separations for 31 candidate HMSCs. The data have been taken from Contreras et al. (2018); Svoboda et al. (2019); Sanhueza et al. (2019), and from the sources in this paper. Clump properties for the candidate HMSCs in the single pointing mapping of Svoboda et al. (2019) are taken from Paper I when possible, to improve the consistency of the data. Therefore, the number distributions for the sources of Svoboda et al. (2019) here are slightly different from the raw ones. There are a total of 363 separations. The size of the bin is set to be 0.075 (color-filled histogram) and 0.15 (black-edge histogram) to avoid bias. Red and blue lines mark the two peaks of the distribution.