Panel a: comparison of our M_ph–V_rot relation with the stellar mass Tully–Fisher relation from McGaugh & Schombert (2015) and two relations (for two kinds of stellar mass estimates) from Reyes et al. (2011). The meaning of each line is described in the legend. Each relation is shifted along the M-axis in such a way that the log M = 10.7 at log V_rot = 2.3. Panels b and c: same as panel a but for the M_sp–V_rot and M_ma–V_rot relations, respectively.