Fig. B.1
Velocity channel maps of the 13CO emission in the blueshifted (a) and redshifted (b) medium-velocity ranges. Contour levels are 5σ, 10σ, 20σ, and 40σ, where 1σ is 7 mJy Beam-1. Color scales are in units of Jy Beam-1. Crosses denote the position of HL Tau. Filled ellipses present the size of the synthesized beam. The LSR velocity in units of km s-1 of each channel is labeled in the upper left corner in each panel.
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