Fig. 1.
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Comparison between two absorption lines fitted with Voigt profiles in XQR-30 (upper panels; black line: observed spectrum; red line: observed error; blue line: continuum level; green line: Voigt profile fit) and their theoretical profiles without the convolution with the instrumental broadening (lower panels). The theoretical profile of the line on the left is saturated, while the theoretical profile of the line on the right is not.
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