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The number of spikes and the number of cells in two-dimensional simulations in the domain in Fig. 1a.
| # Cells | # Spikes |
|---|---|
| 6120 | 135 |
| 1738 | 135 |
| 514 | 132 (3) |
The spikes were counted throughout the grey matter. Only in the coarsest case did any waves fail to propagate from the unstable region. In that case, only the first three (i parenthesis) spread to the stable parts of the grey matter. The total number of spikes were counted over a 10 s interval.
