Fig. A.3.
Extinction curve fit for GRB 181020A. The raw combined VLT/X-shooter spectrum is shown in gray, overplotted with a binned version to enhance the continuum trace. The best-fit SMC-like extinction with AV = 0.27 ± 0.02 mag is shown by the solid red line, where the error on the fit is shown by the dashed red lines. The best-fit intrinsic spectral slope is overplotted as the solid blue line.
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