Comparison of the velocity profiles of the 13CO(4-3) (blue solid line) and 12CO(3-2) lines (green dotted line). The uncertainties on the 12CO spectrum are not plotted, since they are negligible compared with the 13CO ones. We normalized all the lines to have ∫Sν dν = 500 Jy km s−1. With this normalization, the peak flux of a line with a typical 500 km s−1 width is unity. The red dashed line is the 13CO(3-2) profile measured by Zhang et al. (2018).
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