redshift $z$ and $b_{\textrm{tur}}$, for a given component, resulting in different column densities for different ions. We expect the , , and possibly to be co-spatial and therefore to show a similar line profile. This is what we observe in the line-of-sight to . The $\lambda$1304 transition was excluded from the analysis because it is blended with the possibly dominating $\lambda$1304 line. The 600z spectrum was not included in the Voigt profile fit because of its poorer spectral resolution. The two components that model the line profiles are separated by $148\pm25$ km s$^{-1}$. The normalization was determined locally around each line and telluric features were excluded from the fit. Figure \[fig5\] shows the two-component Voigt profile fit to the lines in the medium resolution spectra. The abundances and corresponding metallicities are presented in Table \[tab3\]. Iron is probably depleted onto dust grains and is thus not a good metallicity indicator [@Savage96]. The best metallicity estimate is derived from silicon \[Si/H\] $=-1.21\pm0.16$ (1$\sigma$ uncertainties), corresponding to $Z/Z_{\odot}= 0.06^{+0.03}_{-0.02}$.\

![The line profiles in the medium resolution 1400V and 1200R spectra are best modelled with two components separated by $148\pm25$ km s$^{-1}$ in velocity: $z_a=2.6396\pm0.0003$, $z_b=2.6416\pm0.0003$ (dotted lines), $b_{\textrm{turb, a}}=38\pm7$ km s$^{-1}$, $b_{\textrm{turb, 