Ratio of total mass to B‐luminosity of disk ﹩M_{t}/ L_{B}﹩ (see text for details) plotted against the disk scales ratio ﹩z_{0}/ h﹩. The notation in the figure is the same as in Fig. 12. The three lines represent the model values of ﹩M_{t}/ L_{B}﹩, which were calculated based on Fig. 15 with mass‐to‐light ratios of 1 (solid line), 5 (dot‐dashed line), and 15 (dashed line).