Left: cumulative number of wr(2796) > 0.3 Å intervening Mg ii systems towards blazars, excluding the systems with Δv < 5000 km s-1 (thick, black curve). The curve of intermediate thickness (red) shows the cumulative number of such Mg ii systems towards QSOs, adopting the incidence of these systems given by Nestor (see text), and the thinner (green) one is obtained by normalizing the latter to the total number of Mg ii systems towards blazars. Center: incidence of strong (wr(2796) > 1.0 Å) Mg ii systems adopting the incidence of these systems given by Prochter et al. (2006a). Right: incidence of weak (0.3 < wr(2796) < 1.0 Å) Mg ii systems.
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