Fig. 9
Distributions of Z-sensitive ratios. From top to bottom: Ciii]λ1909/Civλ1549 for the GTC sample (the dashed histogram is for population B). Dot-dashed lines trace the expected ratios for Z = 0.1 Z⊙ and Z = Z⊙ for log nH= 10 and log U = − 1.75. Middle: distribution of the ratio Nvλ1240/Civλ1549 for the GTC (black lines) and the Shin et al. (2013) low-z sample (gray lines), with the restriction log L ≥ 46.2 [erg s-1]. Bottom: the same for the ratio (Oiv]λ1402+Siivλ1397)/Civλ1549.
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