Fig. 3
The redshift distribution of the sight line number density n(X) of strong Mg ii absorption systems per comoving Mpc (bins of Δz = 0.15). The blue curve shows an exponential fit to this number density. The yellow curve shows the fit of Prochter et al. (2006a) to their strong Mg ii absorber sample. The shaded areas show the 1σ uncertainties on the exponential fits.
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