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Table 1

The radiative transfer models.

Radiation field Dust model Figures Notes

isotropic, χ = 2 OH Fig. 7
isotropic, χ = 3 OH Fig. 7
isotropic, χ = 4 MWD Figs. 8, 13
isotropic, χ = 4 OH Figs. 8, 9, 13, 16
anisotropic, χ = 3 + 1a OH Figs. 10, 11, 14
anisotropic, χ = 3 + 1a MWD Fig. 14
isotropic, χ = 4 MWD Fig. 15 n × 2b
anisotropic, χ = 3 + 1 MWD Fig. 15 n × 2b

Notes. 

(a)

Ratio 3:1 between isotropic background and additional radiation from the south-eastern direction.

(b)

Densities twice the values obtained from the modelling of sub-millimetre emission.

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