Figure 9.

Embellished P₈ = 89 Patterson map from Fig. 8. Unit cell axes are marked and the a axis is vertical. The map has mirror symmetry parallel and perpendicular to the a axis at the origin and at a/2 marked with a cross. The centers of symmetry located at the left and right margins are also marked. Circles of radius τE and τ²E are drawn about the crystallographic origins. Circles of radius τE are drawn about a set of quasiequivalent origins related by the local noncrystallographic 10-fold axes and the crystallographic centers of symmetry. Circles of radius τ²E can also be drawn around the quasiequivalent origins, which fit like that about the crystallographic origin.