Fig. 5
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Position-velocity diagram of C18O (2–1) toward IRS3A extracted along the orientation of the disk with a width of 1″. The black contours highlight levels at 4, 8, and 16×σline (σline = 0.22 K, Table 1). The best- fit derived by KeplerFit is shown as a dashed red line. The ranges in radius that are included in the fit are indicated by the solid red line.
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