High-resolution observations in OMC-3. From left to right and from top to bottom: (a) ALMA interferometric-alone (int-CLEAN) continuum map (4″.5); (b) WISE 3.4 μm emission (6.1″); (c) gas kinetic temperature, T_K(30″), (d) N₂H⁺ (1–0), (e) HNC (1–0), and (f) HC₃N (10–9) integrated-intensity maps obtained in our ALMA+IRAM-30 m MACF observations (4″.5). The symbols are similar to those in Fig. 1. Similar plots for all the other regions can be found in Appendix B. The enhanced resolution of our ALMA+IRAM-30 m maps (panels a, and d–f) can be seen from their comparison with the gas T_K map (panel c) displayed at the single-dish resolution.