Fig. S4.

Additional crystallographic texture analysis using STEM images. Additional stitched STEM overview images of various interconnected crystallites with a view perpendicular to the wing scale; the field of view is bordered on the left and the right by glue. Crystallites exhibiting a fourfold symmetry (<001> zone axis oriented very close or parallel to the scale surface normal) are highlighted in red, and those crystallites with a threefold symmetry (<111> zone axis oriented parallel to the scale surface normal) are highlighted in blue.