Fig. 4. Spectra of e-vector angles of the arm stripes of the squid and the cuttlefish oriented parallel (A,B) or perpendicular (C,D) to the y-axis. Data collected in Position 2 (see Fig. 1). As in Fig. 3, different colored spectra represent the calculated results from samples at various tilt or rotation angles (key in A also applies to B–D).