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(Left) Viscous stress (S) from a Definity (black line) and Optison (gray line) bubble oscillating in a 3.15 MHz field, with PD of 5 cycles and PRF of 10 Hz. Pr was varied between 0 and 4 MPa and R0 was 1.1 μm. (Right) Zoomed in to better appreciate Pr of 0–0.8 MPa.
