Figure 3.

(a) TEM micrograph showing a cross section through the scale of P. sesostris. (Reproduced with permission from Vukusic & Sambles (2003).) The numbers indicate various domains in the cuticle crystal. The vertical lines indicate the position of the grain boundaries. Scale bar, 2.5 μm. (b) Computer-simulated projections for a G-structure with t=−0.3 (equations (2.4) and (4.1)). The projections are generated from sections with a thickness of 0.15a (a denotes the length of the cubic unit cell) along the directions: 1, [1 2 3]; 2, [1 1 11]; 3, $[\overline{4}8\overline{11}]$; 4, [4 9 12]; 5, $[\overline{1}9\overline{12}]$; 6, [2 4 9]; 7, $[7\overline{10}\overline{12}]$; 8, [7 7 10]. The chitin (cuticle) structures appear black in both the micrograph and the simulation.