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Figure 4 The time course of individual QW7437 microbubble velocities in six venules with a vessel diameter between 11 µm and 30 µm (a) and in four venules with a vessel diameter between 31 µm and 50 µm (b). Open squares show microbubbles with transient stoppage (0.1 s stoppage at one site), and small closed squares show microbubbles without transient stoppage.