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The average absolute differences in the vial positions in the most distal and proximal axial slices (see Fig. 8).
| Direction | Column 1 avg (mm) | Column 2 avg (mm) | Column 3 avg (mm) | Column 4 avg (mm) | |
|---|---|---|---|---|---|
| Row 1 | FE | 1.0 | 1.1 | 1.6 | 2.5 |
| PE | 1.9 | 0.4 | 0.9 | 2.3 | |
| Row 2 | FE | 0.9 | 0.0 | 0.6 | 1.4 |
| PE | 1.4 | 0.0 | 1.4 | 2.9 | |
| Row 3 | FE | 1.3 | 1.0 | 0.6 | 0.8 |
| PE | 1.2 | 0.5 | 2.1 | 3.4 |
