W(Mg IIλ2796) as a function of Ca IIλ3934 (red stars) and Na Iλ5891 (blue stars) equivalent widths. Green points are from Wild & Hewett (2005) for systems with 0.6 < zabs < 1.3. The orange triangles are the sample from Richter et al. (2011). The three dashed lines are for W(MgII)/W(CaII) = 1, 2, and 4 respectively.
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