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| Scheme | Working set | R-free set | Example PDB entry† |
|---|---|---|---|
| 1 | o | f | 1aa6 (1dzi) |
| 2 | 0 | 1 | 101m (1a4i) |
| 3 | 1 | 1 | 1a8d |
| 4 | Positive integer | 0 | 1b7d |
| 5 | Positive real number | 0.00 | 1c3c |
| 6 | 1.0 | 0.0 | 1a27 |
PDB identifiers in parentheses are examples of reversed usage of the scheme.
