Histogram of logarithmic hydrogen volume densities for 41 HVCs in the barycentre direction (blue) and 8 HVCs in the anti-barycentre direction (red), based on our Cloudy modelling of these absorbers presented in Sect. 4. The black dashed line and the arrow indicate the region for which the MW radiation field plays a role (see Sect. 5.1.3).
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