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Fig. 4


a) Peaks of the CH3CN(19–18) K = 2 line emission (solid circles) obtained with a 2D Gaussian fit channel by channel. For each peak the corresponding 50% contour level is also drawn (using the same color as the peak). The color corresponds to the line-of-sight velocity, according to the scale displayed to the right. The ellipse in the bottom right denotes the synthesized beam. b) Comparison between the velocity of the best-fit Keplerian disk (color map) and the emission peaks at different velocities (solid circles) obtained for the following lines: CH3CN(19–18) K = 2,3,4, CH3OH(71,6–61,5) vt = 1, CH3OH(141,13–140,14), and HC3N(37–36). The crosses mark the position of the continuum peak.

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