Table 4.
Static error with or without light (mm).
| Operator | With light (low intensity) | Without light |
| 1 | 2.70 | 0.63 |
| 2 | 2.82 | 1.47 |
| 3 | 3.93 | 1.01 |
| 4 | 1.74 | 1.3 |
| 5 | 2.97 | 1.63 |
| 6 | 4.69 | 1.45 |
| 7 | 1.11 | 1.96 |
| Mean (SD) | 2.85 (1.21) | 1.35 (0.43) |
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