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| song | |||||
| associated | no association | not present | total | ||
| associated | 16 | 0 | 7 | 23 | |
| stack | no association | 1 | 0 | 2 | 3 |
| not present | 0 | 0 | 0 | 0 | |
| total | 17 | 0 | 9 | 26 | |
Out of 17 units where both stacks and song were present in sufficient quantity to permit statistical analysis, 16 had firing patterns that were associated both with stacks and song.
