Fig. 7
Domain of density and ionization parameter where metastable absorption line from B-like (solid) and C-like (dotted) ions can be used for diagnostics in the case of photoionized equilibrium (see Sect. 4.2 for a detailed description). Dashed lines indicate the distance of the photoionized plasma with respect to the central engine. L37 is the 1 to 1000 Ryd luminosity in units of 1037 W.
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