Fig. 2. Chord length distributions of theoretical wings and a ratfish pectoral fin. (A) Chord length distribution of the pectoral fin of the adult ratfish. Total area 0.0069m²; aspect ratio 2.2. (B) Sample chord length distributions generated with a first-degree polynomial. (C) Chord length distributions generated with a second-degree polynomial. (D) Chord length distributons generated with a third-degree polynomial. (E) Chord length distributions generated with a beta distribution. (F) Chord length distributions generated with an exponential function. Chord length distributions in B–F represent wings of the same aspect ratio (2.5) and area (0.0069m²). See Appendix 2 for the mathematical equations used to generate the theoretical wings.