Positionally averaged spectra of ¹³CO (red), C¹⁸O (green) and C¹⁷O(1−0) (blue) lines. The regions considered (from left to right) are: a ~ 4 × 4 arcmin² region around positions (RA ~07^h11^m18^s, Dec ~− 10°36′; corresponding to the isolated individual region in the SE); a ~ 4 × 2 arcmin² region around position (RA ~07^h10^m42^s, Dec ~− 10°23′), at the NE end of the secondary filament; and a ~ 8 × 3 arcmin² region around the bright region of emission toward the NW along the main filament. These last two regions are shown as black boxes in Fig. 2. The dashed vertical line corresponds to the velocity, 15.6 km s^-1 obtained with a Gaussian fit to the C¹⁸O(1−0) line of the first region.