Fit of the intervening Lyα absorption features towards galaxy D7 (z_abs = 3.085; log N(H   i) = 20.7 ± 0.2) and towards GRB 070721B (z_abs = 3.0939; log N(H   i) = 20.1 ± 0.3), and the Lyα absorption feature in the DLA galaxy D3 (z_abs = 3.096; log N(H   i) = 21.3 ± 0.2). The fit of D3 nicely shows the Lyα emission in the red part of the trough. The afterglow spectrum (D4) was acquired with VLT/FORS2, while the displayed spectra of D3 and D7 were extracted from the VLT/FORS1 data. The fit is shown with a solid line, while 1σ errors are displayed with the shaded region.