Fig. 1. Reconstructed geometries of scanned samples. Sand samples were scanned using X-rays from (A) tubes or (B) synchrotrons with a voxel size of 60 and 3.5 µm and a sample diameter of 25 and 5 mm, respectively. The glass bead columns with diameters of (C) 52 mm and (D) 40 mm, respectively, were scanned using thermal neutrons with a voxel size of 167 µm. In the latter case, the pore space was water filled at the bottom of the column.