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Fig. 8.


Density vs. temperature derived from the observed excited C I fine-structure levels in the absorber toward image A (top) and image B (bottom) assuming fH2 = 1. The allowed 1σ ranges calculated for C I* and C I** are shown as solid and dashed contours, respectively. The combined constraint on density and temperature is shown as the shaded gray regions. The curves on the right-hand axes show the marginalized probability density distributions for nH assuming fully molecular gas (solid) or the observed, average molecular fraction (dotted).

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