Table 3.
Model parameters
| Model | R f | r 1 | r 2 | ϕ 2 | r 3a | r 3b | ϕ 3 | r 4 | ϕ 4 |
|---|---|---|---|---|---|---|---|---|---|
| UF | 21·9 | 0·0 | 24·0 | –8·0 | 27·0 | 33·0 | –35·0 | 49·0 | –15·5 |
| UA2 | 11·6 | 0·0 | 22·3 | –8·0 | 27·0 | 32·0 | –35·0 | 49·0 | –28·0 |
| UA1 | 13·8 | 0·0 | 22·0 | –8·0 | 27·0 | 32·0 | –35·0 | 49·0 | –30·0 |
| US | 12·0 | 0·0 | 22·0 | –8·0 | 22·0 | 32·5 | –35·0 | 49·0 | –25·0 |
| SST | 12·9 | 0·0 | 22·0 | –8·0 | 25·0 | 32·0 | –35·0 | 49·0 | –35·0 |
| MAT | 11·0 | 0·0 | 23·0 | –8·0 | 28·0 | 32·0 | –35·0 | 49·0 | –30·0 |
| AM | 9·8 | 0·0 | 22·0 | –8·0 | 30·5 | 33·4 | –35·0 | 49·0 | –30·0 |
| PTA | 16·0 | 0·0 | 22·0 | –8·0 | 30·5 | 34·0 | –35·0 | 49·0 | –30·0 |
| AM 37°C | 10·7 | 0·0 | 24·0 | –8·0 | 28·7 | 33·5 | –35·0 | 49·0 | –30·0 |
Values of Rf factors comparing the averaged images with the models displayed in Figs 2 and 3; and model co-ordinates as shown diagrammatically in Fig. 5. Radial co-ordinates (r1 through r4) are in ångström units measured from the 6-fold axis and angles, ϕ2 through ϕ4 from the [1, 0] lattice vector, are in degrees.