Fig. A.1.

12CO rotational temperatures (, computed by fitting a straight line to synthetic line intensities in the Jup = 5−10 range) obtained from isothermal non-LTE models. The red curve shows the parameter space that reproduces the observed Trot of the HPVW component. The blue-shaded area shows the estimated gas density of the high-velocity cloudlets detected by ALMA (Goicoechea et al. 2018). The magenta, red, and blue curves show rmsmin/rms contours of 1, 0.95, and 0.9 respectively, where rms refers to the rms value of log10 (IHIFI/Imod).
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