Example spectra of [¹²C II] and ¹²CO 6 → 5 lines with a fit to the HFS F = 1 − 0 component of the average [¹³C II] line. The upper panels show the spectra/fit in a smoothed 30″ beam at the positions marked by a black circle in the lower panel of line-integrated [C II] emission and ¹²CO 6 → 5 emission contours (10 to 130 by 10 K km s⁻¹). The two pairs of gray lines mark the blue and red velocity ranges of the large expanding [C II] shell over the whole RCW79 region (Bonne et al. 2023). The two pairs of black lines outline approximately the velocity range of the expanding [C II] shell. The black star in the lower panels indicates the position of the O-star and the green dashed circle the 8 μm ring. A movie showing all spectra is available online.