Fig. 1From: Triaxial testing and hydraulic–mechanical modeling of sandstone reservoir rock in the Upper Rhine GrabenSamples for the triaxial tests for a layered PfSst and c unlayered TenSst. Thin section images of b PfSst and d TenSst in BSE mode with their mineral composition and pore space (black) (after Schmidt et al. (2017)). Note the different scalesBack to article page