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The air gaps between the bolus and the chest wall in five regions.
| Centre (cm) | Upper Outer (cm) |
Upper Inner (cm) |
Lower Outer (cm) |
Lower Inner (cm) |
|
|---|---|---|---|---|---|
| Mean | 0.04 | 0.18 | 0.04 | 0.04 | 0.07 |
| Max | 0.33 | 0.68 | 0.36 | 0.26 | 0.47 |
| Min | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
