Last measured point radii and velocities for dwarf galaxies. The datapoints represent the radii and velocities at the LMP for some of the galaxies with resolved HI observations (Sect. 3.1). This plot is restricted to V_LMP< 50 km s^-1, where most of the “failing” extreme dwarf galaxies in Fig. 6 are found. The datapoints are color coded according to their original data reference, same as in Fig. 6. The three blue lines represent the RCs of NFW halos that are assigned through AM to galaxies with V_rot = 15 km s^-1. In particular, the solid line represents the fiducial AM result (Fig. 6), the dotted line represents the AM result including baryonic effects on the abundance of halos, and the dashed line represents the AM result including baryonic effects on the abundance of halos and observational incompleteness of the ALFALFA VF (see Fig. 9).