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| number of averaged scans | Retardation [°] (mean+/− SD) | Optic axis [°] (mean+/− SD) |
|---|---|---|
| 60 | 13.2 +/− 1.9 | −48.9 +/− 4.3 |
| 50 | 13.1 +/− 1.9 | −49.1 +/− 4.8 |
| 40 | 13.2 +/− 2.1 | −49.3 +/− 5.1 |
| 30 | 13.2 +/− 2.4 | −49.5 +/− 5.8 |
| 20 | 13.3 +/− 2.9 | −49.8 +/− 6.9 |
| 10 | 13.2 +/− 3.9 | −49.0 +/− 9.1 |
