Radial profile sampling of the DCO⁺ integrated intensity in OMC-2 and OMC-3. Left panel: Integrated-intensity map of DCO⁺ (3–2) (see also Fig. 1), masked based on the criteria discussed in Sects. 3.2,4.1. The dashed red line represents the axis used for the radial sampling. Right panel: Average intensity (I_bs) and temperature (T_K) radial profiles computed across the red line in the left panel. The Gaussian best fit to the profile is also displayed (solid black line), along with the derived FWHM (solid arrow).