Figure 3
(a) In space group P1 the ASU covers the whole unit cell and has the shape of a parallelepiped or, as in this special case, a cube. The angles marked in light blue are denoted in the text as and the angles marked in dark blue as . (b) The ASU (blue tetrahedron) embedded within the unit cell (black) of the cubic space group . The internal angles at the vertices (light blue) and edges (dark blue) of the ASU are marked. |