 | Acta Crystallographica Section D Acta Crystallographica Section D BIOLOGICAL CRYSTALLOGRAPHY |
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![[Figure 2]](gr2237fig2mag.jpg)
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Figure 2
φ–μ polar plot for a reflection. The dark solid (nearly) straight line represents the active-source line for this particular reflection. μmax is the maximum convergence angle of the optic and μmin is the minimum convergence angle for this particular reflection. For every μ between μmin and μmax there generally are two points φN(μ) and φX(μ) on the active-source line which satisfy the diffraction condition for this particular reflection, where the subscripts `N' and `X' designate `entrance' and `exit' owing to their similarity to a screenless precession experiment (Xuong & Freer, 1971  ). |
![[Figure 2]](gr2237fig2.jpg)
| BIOLOGICAL CRYSTALLOGRAPHY |
ISSN: 1399-0047
