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**Detailed framscan analysis** **A** Baseline fluorescence (dye distribution)  in the zoomed in region from Figure \ref{fig:frame_fit}. **B** Map showing the time for the wave to reach its maximum. **C** Map showing wave FDHM **D** Map showing the time difference between actual time of wave maximum and expected time. Arrows indicate the gradient plot **B** **E** Wave slowness - i.e., highest resistance to wave traversal.