Velocity-integrated maps of the different tracers used to probe the emission towards OMC-2 FIR 4. Upper panels: velocity-integrated maps of C¹⁸O, CS and SiO in colours, with superimposed contours of the velocity-integrated emission of CH₃OH (5_1,4 − 4_1,3 A) line (white). The colour scale wedges are shown at the top of each panel. The different cores are depicted with magenta stars and are labelled in white. The synthesised beam of CH₃OH and the other molecules are depicted in the lower left corner in white and yellow, respectively. In the SiO panel, the positions of the SiO peaks from this study are depicted with filled grey triangles. The primary beam at the full width at half maximum is depicted in white. Middle panels: velocity-integrated maps of CH₃OH lines at E_u = 45 K and E_u = 50 K and of CH₃CN. On the latter, we superimposed the contours of the velocity-integrated emission of CH₃OH (5_1,4 − 4_1,3 A) line (white). The colour scale wedges are shown at the top of each panel. The positions of the three masers detected in CH₃OH (4_−2,3 − 3_−1,2 E) are depicted with filled blue squares. Lower panels: velocity-integrated maps of H¹³CN, HC₃N and CCH in colours with superimposed contours of the velocity-integrated emission of CH₃OH (5_1,4 − 4_1,3 A) line (white). The colour scale wedges are shown at the top of each panel. The methanol contours start at 10σ with σ = 12.3 mJy beam⁻¹ km s⁻¹.