Our X-shooter spectra of the afterglow of GRB 221009A on 2022 October 10 and 20. For clarity, the spectra shown in the bottom panel have been rebinned by a factor of 10 (first epoch) and 40 (second epoch). The UVB, VIS, and NIR arms are color coded in cyan, green, and red, respectively. The blue dashed lines show a power law with a spectral index of β = 0.8 (F_ν ∝ ν^−β), extinguished by a foreground extinction of A_V = 4.177 mag, assuming the MW extinction law from Cardelli et al. (1989). The solid black lines show a bluer β = 0.4 spectrum with A_V = 4.7 mag, and provide a slightly better description of the data. The upper panels show zoomed-in regions around the Ca II absorption and Hα emission at z = 0.151 (the afterglow continuum was digitally subtracted from the 2D plot) as well as the Na I D absorption complex due to dust in the MW.