| Item Value |
Description |
| n.a. |
no constraints on positional coordinates |
| D |
distance or angle restraint on positional coordinates |
| G |
rigid-group refinement of positional coordinates |
| R |
riding-atom site attached to non-riding atom |
| S |
special-position constraint on positional coordinates |
| DG |
combination of the above constraints |
| DR |
combination of the above constraints |
| DS |
combination of the above constraints |
| GR |
combination of the above constraints |
| GS |
combination of the above constraints |
| RS |
combination of the above constraints |
| DGR |
combination of the above constraints |
| DGS |
combination of the above constraints |
| DRS |
combination of the above constraints |
| GRS |
combination of the above constraints |
| DGRS |
combination of the above constraints |