| Allowed Value | Details |
|---|---|
| 0 | initial entry |
| 1 | all other types of modification |
| 2 | modifications to CONECT records |
| 3 | modifications affecting the coordinates or their transforms (CRYST1, ORIGX, SCALE, MTRIX, TVECT, ATOM, HETATM, SIGATM records) |
| 4 | layer 1 to layer 2 revision which may affect all record types |
| 5 | data uniformity processing |
| Allowed Value | Details |
|---|---|
| 0 | initial entry |
| 1 | all other types of modification |
| 2 | modifications to CONECT records |
| 3 | modifications affecting the coordinates or their transforms (CRYST1, ORIGX, SCALE, MTRIX, TVECT, ATOM, HETATM, SIGATM records) |
| 4 | layer 1 to layer 2 revision which may affect all record types |
| 5 | data uniformity processing |