Radial-velocity distribution of Grus II (left panel) and Tucana IV (right panel). The black bars represent the non-members, and the colored ones show the members. The shaded bars represent the HB members, which do not present any significant difference or offset from the RGB stars in radial velocity. We only include stars with red spectra available, but we note that the HB stars 1 and 14 in Grus II are members based only on measurements from blue spectra (Table E.1).