Fig. 4.
Predicted reflectance (black line) from azimuthal average of SAXS patterns versus measured optical reflectance (blue line) for (A) Teinopalpus imperialis, (B) Parides sesostris, (C) Callophrys (Mitoura) gryneus, and (D) Cyanophrys herodotus. The SAXS predicted reflectance follows from Bragg’s law and is given by mapping the X-ray scattering intensity from scattering wave vector to wavelength space by choosing a value of 1.16 for the average refractive index, nav, which corresponds to a chitin volume fraction of 0.25. See text for details.