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Formation of the precursor shock in free-field shock-induced collapse. (a) History of the jet velocity (solid line) and of the left-hand side of equation 4.3 (dashed line). (b) Pressure (top) and γ (bottom) profiles along the centreline. Dashed line: t/(Ro/cL) = 9.24; dotted line: t/(Ro/cL) = 9.52; solid line: t/(Ro/cL) = 9.61.
