Residuals from the VL (left) and RL (right) relations as a function of disk central surface brightness, disk scale length, rotation velocity, concentration index, ﹩V-I﹩ color, and optical morphological type for all the galaxies in our sample. Besides the expected dependence of the RL relation on ﹩\mu _{0}﹩, the scatters of the VL and RL relations may show weak correlations on color and concentration, respectively.