Fig. 4

Box–whisker plots of the petrophysical and petrographical characteristics of the analysed sandstones. Data are presented according to their locations, from west to east. The individual boxes are coloured according to their fabric type. a Porosity, b cementation, c clay content, d grain size, e bulk density, f uniaxial compressive strength \(\left( {UCS} \right)\), g indirect tensile strength \(\left( {T_{0} } \right)\), and h static Young’s modulus \(E_{\text{stat}}\). Equivalent information from Leistadt, Riesenstein, and Kammerforster are adopted from Soyk (2015)