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Fig. 3
Example of ortho- and para-H2CO lines (black histogram spectra). A non-LTE LVG model (Tk≃ 200 K, n(H2) ≃ 1 × 106 cm-3, N(o-H2CO) = 4.0 × 1013 cm-2, and N(p-H2CO) = 1.8 × 1013 cm-2) is shown overlaid in red (see Sect. 5.2). The dashed lines indicate the LSR velocity (10.7 km s-1) of the Orion Bar PDR.
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