Fig. 4
Intervening Mg ii absorption at zabs = 0.852 towards AO 0235+164 in the 1997 December (HIRES, black line) and 2007 February (UVES, red line) spectra (lower panel: Mg iiλ2796; upper panel: Mg iiλ2803). The blue vertical tick underlines a marginally variable blended component at zabs = 0.85237, although at only a 2.3σ significance level.
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