Properties of one (level 4) HMAC cluster tentatively identified with Serpens (but see text) with no sources in common with BANYAN associations. From left to right: Equatorial coordinates with various colours separating subclusters at a hierarchy level lower (and hence finer) than 4; CAMD (points represent the full set of UCD candidates in the catalogue, and circles identify the HMAC group at level 4; black dots represent sources not assigned to any subcluster in the lower level); tangential velocities; and the stacked histogram of the inverse of the parallax in all subclusters.