Fig. 16.
Upper panel: comparison of the measured nH, free and nH, tot. The nH values are in units of 1022 cm−2. The vertical dashed line denotes 0.05 × 1022 cm−2. The solid line corresponds to nH, free = nH, tot. Lower panel: ratio of all the best-fit abundance values obtained by adopting our strategy in nH (free to vary in a limited interval around nH, free) and by fixing nH to nH, tot, as a function of nH, tot.
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