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| Detection | Discrimination | Mean | |
| Horizontal | 23.5 (2.2) | 136.8 (9.4) | 80.1 (7.1) |
| Vertical | 23.5 (2.3) | 134.9 (9.5) | 79.2 (7.0) |
| Mean | 23.5 (1.6) | 135.8 (6.7) | 79.7 (5.0) |
Values in parentheses are standard errors.
