Fig. 4
The left and right panels present in color, respectively, the 1st and 2nd moment maps in CH3CN(126 − 116) toward NGC 7538IRS1. The contours show the 1.36 mm continuum emission with the same contour levels as in Fig. 2. A scale-bar and the synthesized beam are presented in each panel. The line in the left panel outlines the axis for the pv-cuts in Figs. 5 and 6.
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