Relation between dynamical mass and the number of satellites for SAGA galaxies, for which HI line measurements exist in the EDD database: gray circles with error bars denote the number of satellites detected up to the limit of M_r, 0 < −12.3; red crosses give the expected number of satellites if the relation from Javanmardi et al. (2019) holds. Error bars on the y-axis are simply the square root of the number of satellites. Dynamical mass is calculated from Eq. (4), with error bars corresponding to the errors on the rotation velocity only, meaning they are underestimated.