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| Diameter (mm) | Air Columns for EV | Reference Volume (mm3) |
|---|---|---|
| 30 | E1 | 28.416 |
| 10 | E2, E3, E4, E5 | 3.157 |
| 5 | E6, E7, E8, E9 | 0.789 |
EV = emphysema volume, WA% = wall area percentage
