Modified Model 3 with input gas density, kinetic temperature, and velocity profiles from codex models 250420 (top), 261740 (middle), and 286060 (bottom). Special scaling has been applied to the input gas density (see text). The infall velocity profiles are plotted on the left and the selected resultant spectra are shown on the right. We applied constant extrapolation of the infall velocity beyond the outer boundary of codex models.