Notes. Columns list redshift, Galactic column density and visual extinction in the line-of-sight to the GRB, the H i, Si ii, S ii, Fe ii and Zn ii column density with corresponding references, the oxygen column density measured from the X-ray spectra, N_O,X, and the best-fit visual extinction, A_V, with both corresponding references given. For GRB 030226 and GRB 090323, two absorbing components were detected within the GBR host galaxy, and the optical column densities for both are given where applicable.

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