Left: schematic cartoon showing the scenario of O2 emission originating from the surrounding cloud. Right: integrated intensity ratios calculated with RADEX, as function of temperature and density, for a C18O column density of 5 × 1014 cm-2 (optically thin conditions). The C18O 3–2/1–0 ratio is relevant for the surrounding NGC 1333 cloud, which is traced by the 8.0 km s-1 component. Dash-dotted lines indicate the observed ratio of C18O 3–2/1–0 = 0.74 for the VLSR = 8.0 km s-1 component.
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