Fig. 4.
Fit of the dust extinction to the afterglow spectrum of GRB 191004B (black line). The solid orange line corresponds to the best-fit extinction (solid orange line) with a spectral index βo = 0.49 ± 0.03 and an SMC extinction law with 
mag. See Sect. 3.3 for more details. The orange dashed line is for the intrinsic spectrum corrected for extinction.
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