Averaged [C II] and ¹²CO and ¹³CO(3−2) spectra for RCW79. The spectra are averaged over the full region mapped in [C II]. The vertical dotted lines mark the velocity intervals associated with the high-velocity wings (defined by the escape velocity), while the vertical dashed line indicates the revised threshold for the onset of high-velocity emission, chosen to exclude contamination from fore- or background sources. The Gaussian fit to the ¹³CO line is in black.