Fig. 5.
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Plot of the αox index vs. the UV luminosity using unabsorbed X-ray luminosities. The gray points are the quasars analyzed in Chiaraluce et al. (2018). The linear best fit is shown as a solid line. The dashed line is the X-ray weak limit defined by Pu et al. (2020). The red squares correspond to the XMM-Newton observations, and the black points correspond to those performed by Swift.
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