Derived total N2H+ column density in our single-dish observations (N(N2H+)SD) as function of the (normalized) Herschel H2 column density (N(H2) − N(H2)0) for all the positions shown in Fig. 7 along the ISF (red) (see text for further details). The positions in OMC-1 are highlighted in blue. Both mean (points) and 1-σ values (errorbars) in bins of 0.3 dex are displayed in green. The expected correlation for a constant abundance ratio of X(N2H+) = 7.5 × 10−10 is indicated by a dashed black line.
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