¹³CO(J = 1−0) spectra along selected lines of sights in the Orion B cloud, showing the diversity of velocity components (up to four per spectrum). The coordinates of the various lines of sights are given in arc-minutes in our custom set of coordinates (δx, δy). The average spectrum for the whole field, normalized to have the same peak temperature, is superimposed with a dashed line for comparison. The positions of the spectra on the map are shown by white squares in the first panel of Fig. 2.