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Fig. 4. Cross-sectional computed tomography images of two sizes of tuff gravel packed inside a column with an inner diameter of 6.22 cm: (a) 16- to 25-mm tuff gravel; (b) 6.3- to 9.5-mm tuff gravel. Spatial resolution in the viewed plane is approximately 0.2 by 0.2 mm. Voxel depth is 1 mm.