OMC-3 as a showcase for the results obtained from the EMERGE Early ALMA Survey (see Papers I and III for details about these maps). (Left panel) N₂H⁺ (1–0) integrated intensity map at a resolution of 2000 au (or 4.5″) obtained by our ALMA+IRAM-30 m observations. (Central panel) Total column density map of H₂ derived at 2000 au resolution. The black contour corresponds to an intensity of N₂H⁺ with S/N = 3. Red lines define the axes of the fibers identified in Paper III where Fiber #7 is highlighted with its ID and further discussed in Sect. 3.1 and Fig. 2. (Right panel) Gas kinetic temperature T_K map determined at the IRAM-30m single-dish resolution of ∼12 000 au (or 30″). In all panels, cyan triangles correspond to the protostellar objects (Class 0/I; Megeath et al. 2012; Stutz et al. 2013; Furlan et al. 2016), while the white star corresponds to a B star (gathered from the SIMBAD catalogue; Wenger et al. 2000).