Upper panel: distribution of the measured neutral hydrogen column densities with log N(H i)> 18.7 for 43 HVC absorbers. Lower panel: distribution of total hydrogen column densities. The gray-shaded area shows the distribution of log N(H) derived for all 179 HVC absorbers. The green-shaded area indicates the distribution of log N(H) for systems with unsaturated Si ii/C ii/Si iii absorption (see Sect. 6.1).
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