CO absorption bands in the LMC towards SK −67 2. The instrument (grating) are indicated at the bottom right corner of each panel. The pixels used to constrain the Voigt-profile model are shown in black, otherwise in grey. The red, blue (green for ¹³CO), and violet lines and shaded regions show the model profiles sampled from the posterior distribution of the fit parameters for the total, main, and additional (with CO constrained as an upper limit) component, respectively. The blue lines at the top of each panel shows the residuals between the observed and modelled spectra. The connected ticks mark lines from J = 0 − 5 rotational levels.