Extinction maps at λ = 541.7 nm from Edenhofer et al. (2024) in the direction of GRB 221009A, integrated in the following distance intervals: 157–225 pc (top-left panel), 243–311 pc (top-central panel), 357–425 pc (top-right panel), 421–493 pc (center-left panel), 503–574 pc (central panel), 357-425 pc (center-right panel), 652–717 pc (bottom-left panel), 683–754 pc (bottom-central panel), and 740–812 pc (bottom-right panel). The regions covered by the two sectors studied in this work are highlighted in white in each panel. The green grid indicates the Galactic coordinates in degrees.