Normalized spectrum of J1321−0041, converted into velocity space. Troughs of individual ionic transitions are color coded, and the integration ranges used for column density calculations are marked by vertical dotted lines. The continuum is represented by a horizontal dashed line. All spectra shown are UVES spectra, except for that of the S IV absorption, which is based on the SDSS spectra due to wavelength range limitations. We note the stark contrast in the signal-to-noise ratio. The bottom three panels show the Fe II and Si II absorption, which were used to estimate n_e.