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Fig. 5. Traces of landmark dots on the opening elytra of Prionus
coriarius, subtended at different aspects in the external reference
system. Open dots, left elytron; filled dots, right elytron. The side of the
cube is 40 mm, bold ribs converge at the point (+20, +20, +20 mm). The 3-D
graph can be tilted so that dots lie approximately along a straight line on
either trajectory, or both trajectories are seen as arcs.