Fig. 17.
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Isophotes tracing the loci of the parameter plane (log U, log nH) consistent with the observed intensity ratios Al IIIλ1860/Si III]λ1892, Si III]λ1892/C III]λ1909, and Al IIIλ1860/C III]λ1909 (shown in log scale). The crossing region defines the (U, nH) parameter range consistent with the values of the three ratios. Top: BC only. Middle: VBC. Bottom: BC+VBC.
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