Fig. 4.
CO(2–1) emission line observed with the PI230 receiver at APEX. On the x-axis, the velocity in km s−1, on the y-axis the antenna temperature in K; the channel width is Δv = 50 km s−1. Two Gaussian functions (in dashed light green lines, while the sum of the two is in dark green) are needed to reproduce the double-peak spectrum profile (in black). A rotation-dominated kinematics is suggested by the double-peaked line profile.
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