Fig. A.1
Smoothed spectrum of the galaxy B9 in the field of view of GRB 050820A. Based on the identification of [O ii] λ3727 and [O iii] λ5007 the redshift is z = 0.428. The galaxy is not related to any of the intervening absorbers seen in the afterglow spectrum. The error spectrum is overplotted. Regions of strong telluric features (atmosphere transparency <20%) were not used in the spectral analysis and are marked by small boxes at the top.
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