Face-on view of the midplane in the disk and inner envelope for the fiducial model, showing the velocity component along the line of sight (indicated by the black arrow on top of the panel; the observer is on the left). The envelope material has a infalling rotating velocity profile (Ulrich 1976; Cassen & Moosman 1981), while the disk material is rotating with Keplerian velocity. The adopted disk outer radius of 125 au is marked by the dashed line. The outer edge of the envelope is set at the radius where the temperature in the best-fit model from T13 drops below 20 K, i.e., the CO freeze-out temperature. The adopted stellar mass is 0.45 M_⊙ (A17).