Synthetic SMA observations made with the CASA task “simobserve” from the outputs of radiative transfer calculations of the envelope-disk model shown in Fig. 5. From left to right, the inclination angle of the rotation axis with respect to the line of sight changes from 10° to 80 °. The color scale shows the CH₃CN (12₃−11₃) first-moment map. The red and blue arrows represent redshifted and blueshifted outflows, respectively. The bottom left of each panel shows the synthesized beam.