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| Collisional outcomes | Porosity evolution | Equation |
| S1 | fluffier | (47) |
| S2 | neutral or compaction | (48) or (49) |
| S3 | compaction | (17), (20), (50) |
| S4 (target) | fluffier | (49) |
| S4 (projectile) | neutral | - |
| B1 | compaction | (25) - (31) |
| B2 (target) | neutral | - |
| B2 (projectile) | both | (49)a |
| F1 | neutral | - |
| F2 | neutral | - |
| F3 (target) | fluffier | (49)a |
| F3 (projectile) | neutral | - |
Notes. (a) The indices of target and projectile must be swapped here.
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