Main axis of the 55 fibers identified by our HiFIVE analysis along the ISF (red segments). Left: SCUBA-850 μm continuum emission (Johnstone & Bally 1999). Right: total N2 H+ integrated emission. The position of both protostars (blue triangles) and continuum sources (blue crosses) are indicated similar to Fig. 2. For reference, the positions of the Trapezium and NU Ori stars (white stars) plus the Orion BN source (yellow stars), are highlighted in both panels. The corresponding beamsizes are indicated in the lower left corner in comparison with a characteristic 0.3 pc scale (black bar). The position of the zoom-in regions presented in Fig. 3 are enclosed by dashed boxes in the SCUBA map. We notice the good correspondence between the position of fibers and the location of the intensity enhancements in the continuum. A green cross indicates the positions with the most blue-shifted velocity detected in our N2H+ maps (see also Appendix B), adopted as the approximate center of collapse of the OMC-1 region (Hacar et al. 2017a).