PDR surface temperature grid (colour scale and solid white contours) from Kaufman et al. (1999), extrapolated as Tgas ∝ n-1 for n(H2) > 107 cm-3. The white contours are drawn at 10, 30, 100 and 1000 K. Overplotted as dashed white contours (same values) is the approximate temperature grid based on Eqs. (6) and (7). The black lines trace the conditions along the cavity walls of the three sources.
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