Mass dispersions σ_M versus spacing dispersions σ_PR (Eq. (2)) for all 46 systems in the mass catalogue. There is no correlation between the two dispersions. The 12 systems in which all PRs < 2 (star symbols) have small spacing dispersions but span a wide range of mass dispersions. Both the inner and outer Solar System have large mass dispersions. The black squares correspond to the inner regions of three systems that contain at least three inner small planets and a minimum of one outer giant (Sect. 5).