Fig. 1
The (uncalibrated) flux in the λλ7200−7780 Å region. Top panel: from the Keck HIRES high-resolution spectrum (Ellison et al. 1999); middle panel: the same spectrum after correction for telluric O2 band (see Sect. 3); bottom panel: from HST STIS spectrum (Lewis et al. 2002), where the continuum (blue dashed line) and a Gaussian fit to the C IV emission line (red curve) are shown. A comparison of middle and bottom panels shows that the O2 correction is satisfactory. The velocity scale is based on the systemic redshift z = 3.911 (Downes et al. 1999).
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