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Table 1
A summary of the key steps in the data analysis method.
| Step | Description |
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| 1 | Thresholding the intensity image resulting in area and intensity time series. |
| 2 | Performing wavelet analysis on the area and intensity time series and identifying time intervals with strong oscillatory power. |
| 3 | Performing a FFT on each of the time intervals with strong power resulting in a phase difference between the area and intensity perturbation and the amplitude ratio A of the perturbations. |
| 4 | Using the phase difference to determine the wave mode (i.e. fast or slow). |
| 5 | Using the amplitude ratio A in combination with Eq. (1) to infer the phase speed. |
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