Model results for OH84 and OH65 in the HVC component. a) Ratio of the OH65-to-OH84 equivalent widths in the blueshifted wing as a function of the thickness of the outflowing shell, Rout/Rint. NOH and Tdust are given by 1.6 × 1017 cm-2, 105 K (green curve), and 3.2 × 1017 cm-2, 90 K (blue curve), yielding very similar results. Other model parameters are τ100 = 1.6, vint = 1700 km s-1, and vout = 100 km s-1. b) Corresponding mass-outflow rates per unit solid angle for full coverage of the far-IR source (f = 1, corresponding to Rint = 75 pc; see also Eq. (A.1) and Table 3). The assumed OH abundance relative to H nuclei is XOH = 2.5 × 10-6. c) Observed (black histograms) and predicted OH84 and OH65 line profiles (NOH = 3.2 × 1017 cm-2) for Rout/Rint = 1.1 (red curves), 1.3 (green), 1.5 (blue), and 2.0 (light-blue).
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