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Appendix A

In Figs. A.1 and A.2 we show the PACS spectra at the centre of the FOV (the nominal position of B1) RA(J2000) = 20^h39^m102, Dec(J2000) = +68°01′105 and towards the PACS emission peak, at position RA(J2000) = 20^h39^m93, Dec(J2000) = +68°01′178, located at offset ( − 5′′; 7′′) with respect to the centre of the FOV.

	Fig. A.1 Spectrum of the spatial pixel at the centre of the FOV, RA(J2000) = 20h39m102, Dec(J2000) = +68°01′105.
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	Fig. A.2 Spectrum of the spatial pixel centred at RA(J2000) = 20h39m93, Dec(J2000) = +68°01′178, corresponding to an offset ( − 5′′,7′′).
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In Table A.1 we list the fluxes at offset (0′′,0′′) and ( − 5′′,7′′) extracted from the line maps convolved at the diffraction size of the CO transition at the highest wavelength, i.e. 131 (PSF at 186 μm). They were obtained by multiplying the line surface brightness by an area of , and were used for the rotational diagram and the RADEX modelling, assuming the same source area.

In Table A.2 we list the fluxes of the OH lines measured at offset ( − 5′′,7′′). Since the OH lines were detected only in one spaxel, we applied the flux correction for a point source that takes into account the size of the PSF.

In Fig. A.3 we show the comparison between the CO line fluxes at the centre of the PACS FOV, offset (0′′,0′′), and three models: the best-fit model obtained considering only the PACS lines (J_up 14) with n = 2 × 10⁴ cm^-3  and T_kin = 1080 K; the best-fit model obtained considering also the HIFI CO (13–12) and (10–9) lines with n = 2 × 10⁵ cm^-3  and T_kin = 580 K and the LTE model with kinetic temperature equal to the excitation temperature derived from the rotational diagram, with n = 2 × 10⁷ cm^-3  and T_kin = 207 K. In Fig. A.4 the same models are shown compared to the CO line fluxes at the peak of the CO emission, i.e. offset (−5′′,7′′).

	Fig. A.3 Fit of the CO lines at offset (0′′,0′′), taking into account only PACS data (dashed curve), adding the HIFI lines (solid curve) and assuming the LTE temperature (dotted curve). Squares are the PACS fluxes and bars represent the range of fluxes estimated from HIFI lines. Error bars include the statistical error from the line fitting and the 10% calibration uncertainty.
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	Fig. A.4 Fit of the CO lines at offset (−5′′,7′′). Error bars include the statistical error from the line fitting and the 10% calibration uncertainty.
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© ESO, 2012