Fig. 4From: Quantitative measurement of bubble textures in pumice clasts using a digital stereo microscope with low-angled ring illuminationRepresentative pumice samples form unit 5a (Taupo plinian fall deposit). Images of the representative samples (Table 2). The left column is the binary images of the DSM-LaRI like the one in Fig. 3c. The middle and right are the SEM images with bubbles appearing black. The scale is common within each columnBack to article page