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Fig. 12

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a) OH119 and OH79 doublets after subtracting the model for the QC+HVC+LVC, thus tentatively isolating the contribution of the low-excitation component (LEC) to the absorption and emission. The green curves show our simple spherically symmetric model for the LEC (Sect. 3.4). b) Inferred OH column density of the LEC per unit of line-of-sight velocity interval across the blue absorption wing after correcting for the covering factor at each velocity, but not correcting for the reemission in the lines (see text). The integral gives a total LEC column of NOH ≈ 7 × 1016 cm-2, in agreement with the detailed models.

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