Ratios of high-ionization line fluxes for our object (red) and for those of B16 (Table 2) surrounding radio-quiet QSOs (blue). The He ii line is detected in only one object of the latter sample, while the C iv line is detected in three objects. The green hatched area represents the range of line ratios compatible with photoionization models (Arrigoni Battaia et al. 2015).
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