Average STIS spectrum of the C IV region from all observations in the 2000–2001 campaign re-binned into 0.05 Å pixels (black histogram) with both the narrow-line and medium-broad components of the fit subtracted from the data. The blue histogram shows the average COS spectrum from 2016 with the narrow-line and medium-broad components subtracted. The STIS data have been scaled up by a factor of 1.45 so that the intensities match in the broad wings. The solid red line tracing the data is the total emission model for the average 2016 COS spectrum with the narrow-line component removed. The velocity scale along the top axis is for C IVλ1548.195, relative to the host galaxy systemic redshift, z = 0.00973 (Theureau et al. 1998).