Figure 1: Comparison between dynamical masses from HI as D08/G09 and dynamical masses from starlight [13]. The dots are the 320 galaxies in ALFALFA/SDSS samples and cross symbols are the 164 galaxies from ALFALFA/SDSS/2MASS subsamples. The solid line indicates that the HI dynamical masses are on-average larger than the stellar dynamical masses.