Fig. 22.
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UV absorption troughs of spectrum taken in 2022 and scaled 1991 spectrum. The 1991 spectrum has been multiplied by a factor 0.74 and redshifted by 2000 km s−1. The troughs of the Si IV λ 1403 and C IV λ 1550 absorption lines are indicated by red triangles. The shaded area gives the wavelength region that was used for cross-correlating the wavelength shifts of the two spectra.
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