Signal | Physical surface combinations | Repetitions |
---|---|---|
1 | Silence-water-ceramic-water-silence | 2 |
2 | Silence-ceramic-water-ceramic-silence | 2 |
3 | Silence-water-ceramic-silence | 3 |
4 | Silence-ceramic-water-silence | 2 |
5 | Silence-water-silence | 2 |
6 | Silence-ceramic-silence | 4 |