Figure 1.

Anomalous scattering factors f′ and f′′ for Se in selenomethionine residues. The curves represent the anomalous scattering factors when the polarization direction of the incident X-ray beam is aligned with one of the principal molecular directions in a C—Se—C moiety. Black curves: along the direction u (perpendicular to the plane containing the C—Se—C bonds). Green curves: along the direction w (bisecting the C—Se—C angle). Red curves: along the direction v (perpendicular to u and w). Data from Bricogne et al. (2005 ▶).