Fig. 5.
Normalized VLT/X-shooter VIS arm spectrum of GRB 181020A in velocity space, centered on the ground-state transition of C I at z = 2.93786. Again, the solid black lines show the data, the blue lines the associated error and the red lines the best-fit model. The C I ground-state and excited line transitions are marked above each of the absorption profiles. Gray shaded regions were ignored in the fit.
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