Fig. 11
Converted H i column density distribution functions f(N). The H i column densities were calculated from the Ca ii and Na i column densities using the correlation found by Wakker & Mathis (2000). The solid lines represent power-law fits (again corrected for completeness of the sample), with a slope of βH i [Ca ii] = −1.26 ± 0.02 and βH i [Na i] = −1.44 ± 0.06.
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