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Fig. 9

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PACS spectrum (represented by the grey-filled histogram) compared to our best model, with the parameters given in Table 1 but with υturb of 0.7 km s-1 and with ortho- and para-HO abundances of 6 × 10-4 and 3 × 10-4, respectively. The 12CO model is shown by the full-blue line, the ortho-HO, by the full-red line and the para-HO, by the full-yellow line.

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