(a) Volume of liquid gallium at selected pressures and 310 K obtained by segmentation using the Otsu criterion in the Avizo software. We notice at room pressure that some small particles are apart from the main part of the sample. (b) Corresponding relative volume evolution under pressurizing liquid gallium. Full and empty square markers correspond to measurement before and after the pressure loss, respectively; full and empty triangle markers are taken from the paper by Li et al. (2014) at 300 K and 330 K, respectively; the solid line is a guide to the eyes.