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Spatial resolution characterization. (a) Depth-time tracking of LSW and inset spatiotemporal map of LSW propagation in sample 2. Blue dashed line represents the linear fit to the wave trajectory in the middle layer and red dashed line shows the linear fit of the wave peak in the third layer of Sample 2. (b) Depth-dependent LSW speed profile measured from (a), a sigmoid fitting, and normalized amplitude of PSF as a function of distance traveled by LSW.
