SFT, SFR, gas-conversion parameter, and dynamical-mass-to-stellar mass ratio of our best-fit model, from the top to the bottom panel, for the error function model. The solid black line in the top panel is the same as the yellow ridge line of Fig. 7. The black dotted and the red dash-dotted curves in the top panel follow the same relation as in Fig. 7, described by Eqs. (18) and (19), respectively. The thin horizontal lines indicate g_conv values applied in our galaxy model (see Sect. 4), where g_conv ≈ 1/3 is about the star formation efficiency found for embedded star clusters (Sect. 2.1).