Original images constituting the data set used for the phase diagrams in the paper Frictional fluid instabilities shaped by viscous forces Zhang D, Campbell JM, Eriksen J, Flekkoy EG, Maloy KJ, MacMinn CW and Sandnes B. Accepted for publication in Nature Communications The experiments involved injection of a viscous mixture (water/glycerol) into dry hydrophobic grains in a Hele-Shaw cell. The cell gap was 0.9 mm, and the outer radius shown in the images is 13.4 cm. The experimental variables were: granular material filling fraction (phi), injection rate (volumetric) and viscosity of the injected fluid. The images correspond to Fig. 2, Fig. 8 and Fig. 9 in the paper, with simulation output corresponding to the experiments included in Fig. 2 and 8. The File names include the experimental/simulation variables. For example: Fig2_exp_phi042_rate1_visc1.jpg - Belongs to Fig 2 in the paper - Is an experimental image - The filling fraction was phi = 0.42 - The injection rate was 1 mL/min The viscosity of the injected fluid was 1 mPs s (i.e. water) The experiments and simulations are described in detail in the Zhang et al. paper.