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Maximum bubble non-sphericity for shock-induced (squares) and Rayleigh (circles) collapse. The non-sphericity is given by the ratio of the projected bubble area to the length of the perimeter normalized by the average radius; a value of 0.5 corresponds to a spherical collapse. The maximum value is achieved at collapse: (a) free-field collapse; (b) collapse near a wall. Shock-induced collapse: ps/po =353; Rayleigh collapse: ps/po = 714.
