Total column density maps of the regions derived from the temperature corrected N₂H⁺ (1−0) integrated intensity (see Eq. (1)). The black contour corresponds again to an intensity of N₂H⁺ three times the noise. The red lines represent instead the axes of the fibers identified in our kinematic analysis (see Sect. 4). Same as in Fig. 1, the cyan triangles are the protostellar objects while the yellow and white stars are respectively the O-B stars.