The phases of coexistence seen in MGCM align with those observed in HhPF (Figure ), with the exception of the case with ρ * = 0.6, which transforms into a slab. The densities that give rise to the slab configuration are known to be lower than those of the cylindrical bubble. This suggests that the effective density in HhPF is greater than in MGCM. We attribute this to the grid effect, which results in softer but effectively larger beads in the HhPF case.