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Time evolution of bubble for (a) Ro=9.72 μm, Pa=10.8, and N=4, (b) Ro=11.61 μm, Pa=7.7, and N=13, (c) Ro=13.84 μm, Pa=9.9, and N=4, and (d) Ro=18.9 μm, Pa=7.7, and N=4.