Negative colour-mapped two-dimensional VLT/FORS2 SPSF-subtracted spectra (top panels), and the extracted one-dimensional spectra (black; lower panels), centred on the [O II] λ λ 3727,3729 Å doublet. Left panel: Q 1323–0021 field shows excess emission from the DLA counterpart extending above the quasar-trace. Right panel: Q 2328+0022 reveals the presence of the DLA counterpart offset from the trace. In both panels, the fitted doublet-components are overplotted in orange, with the resulting emission profiles in purple.