SO line temperature ratio TR(SO 1011−1010)/TR(SO 98−87) versus intrinsic line temperature TR(SO 1011−1010) predicted by RADEX slab models at TK = 50, 500 K (black and red points/curves). Each curve corresponds to the labelled column density NSO/ ΔV increasing from 1015 to 2 × 1016 cm-2 (km s-1)-1 going from left to right. Each dot along the curves corresponds to the labelled log (nH2) (from 106.5 to ≥ 108 cm-3). Models for which the emission in the SO 1011−1010 is optically thin are marked with a cross, optically thick models with a star. The black points indicate the SO line ratio and the SO 1011−1010 line intensity (or their lower/upper limits) corrected for beam dilution in the B2, B3 and R2 knots and in the disk blue and red lobes.
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