Table 2. The constraint ratio for ab initio phase retrieval from symmetry summed diffraction (
), Bragg reflections (
) and from their sum (
).
The lower limit corresponds to cases where there is no solvent content, the rigid-unit support is centrosymmetric and convex, the Bragg reflections are point like and there are no known local pseudo-symmetries in the crystal or other prior constraints. In the last column we also list the estimated percentage of the total number of PDB entries for that space group.
| Space group |
(≥) |
(≥) |
(≥) |
% of PDB |
|---|---|---|---|---|
| Fig. 1 ▸ (tight support) | = 1.9 | = 0.7 | = 2.6 | NA |
|
1 | 1/2 | 3/2 | 23.3 |
|
2 | 1/2 | 5/2 | 16.7 |
|
1 | 1/2 | 3/2 | 9.8 |
|
1/2 | 1/2 | 1 | 5.1 |
|
1 | 1/2 | 3/2 | 5.1 |
|
4 | 1/2 | 9/2 | 4.0 |
|
1/2 | 1/2 | 1 | 3.9 |
|
1/2 | 1/2 | 1 | 3.2 |
|
2/3 | 1/2 | 7/6 | 3.2 |
|
2/3 | 1/2 | 7/6 | 3.0 |
|
8 | 1 | 9 | 0.02 |