Fig. 4.

Crystallographic texture analysis of butterfly wing scales. STEM overview image with viewing direction perpendicular to the scale surface (larger overviews are in Figs. S3 and S4)—crystallites exhibiting a fourfold symmetry (<001> axes oriented very close or parallel to the scale surface normal) are highlighted in red, and those with a threefold symmetry (<111> axes oriented parallel to the scale surface normal) are highlighted in blue (<101> zone axes are not considered, because they are very hard to identify from projections only). Inset shows the partial inverse pole figure displaying the orientation of the scale surface normal w.r.t. the 12 reconstructed crystallites.