Fig. 5.
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Distribution (top) and individual (bottom) values of intensity ratios between prominent lines not used to estimate metallicity. The two panels on the right (AlIII/SiIII] and CIII]/SiIII]) show the ratios involved in the identification of xA sources. Vertical solid lines identify the mean value of the distribution. Dashed lines are set to 1 for the SiIII]/He II and CIII]/He II distributions, and 0.5 and 1.0 for the AlIII/SiIII] and CIII]/SiIII] distributions respectively, according to the UV selection criteria for the xA (Sect. 4.2).
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