Oversampled maps in ¹³CO (7–6) (left) and C¹⁷O (7–6) (right) with the 27′′ beam of Herschel. The υ_LSR and T_mb scales are indicated in the upper right corners. The dashed vertical lines, at LSR velocities of 2.5 km s^-1 and 3.5 km s^-1, respectively, identify two radial velocity components of the fitted Gaussians, shown by the smooth red curves, whereas the observations are shown as histograms.