Fig. 2.
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TPCF computed on the complete spectrum, in black. The dashed vertical lines mark the velocity separation of the most common doublets: C IV (∼500 km s−1), which is the one we are interested in, but also Mg II (∼770 km s−1) and Si IV (∼1933 km s−1). The dark-grey and light-grey shaded regions indicate the uncertainties of 1 σ and 3 σ, respectively.
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