Appendix 1—figure 2. Scheme of the specular angles of illumination used to measure the reflectance of the wings.

(A) shows the coverage of the 13 angles of illumination measured for each wing. The angles analyzed on the proximo-distal plane are represented in (B), and the angles analyzed on the antero-posterior plane are shown in (C). Each letter used to describe the angles (I, E, P, A) refers to the side the light was directed to (Internal, External, Posterior, and Anterior side of wings, respectively).