A new method for predetermining the diffraction quality of protein crystals: using SOAP as a selection tool

Owen, R.L.; Garman, E.

doi:10.1107/S0907444904029567

Figure 5
(a) Variation in the relative orientation of the slow optical axis across a protein crystal. Two peaks 90° apart can be seen; this arises from a change in the sign of sin [delta]

as explained in the main text. (b) shows sin [delta]

changing across the crystal, while (c) shows the change of [varphi]