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Optimal frequencies histogram for each day and group.
| Group | Frequency Range | Day 1 | Day 2 | Day 3 | Day 4 | Day 5 |
|---|---|---|---|---|---|---|
| sham | (6–12) Hz | 27 | 42 | 52 | 36 | 39 |
| (13–20) Hz | 14 | 8 | 10 | 18 | 5 | |
| (21–30) Hz | 22 | 13 | 1 | 9 | 19 | |
| tDCS | (6–12) Hz | 42 | 48 | 53 | 49 | 47 |
| (13–20) Hz | 11 | 10 | 5 | 11 | 6 | |
| (21–30) Hz | 10 | 5 | 5 | 3 | 10 |
