Fig. 6.
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Comparison of the spectra at the location of the CIV A trough, between SDSS 2006 and SDSS 2012 epochs. The shaded region marks the interval of velocity that varied between the two epochs, within which the parameter AS (the fraction of the normalized continuum flux removed by absorption) was derived for each epoch. The dashed line represents the 90% level of the continuum-normalized flux.
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