Supplementary Material from Using step width to compare locomotor biomechanics between extinct, non-avian theropod dinosaurs and modern obligate bipeds BishopP. J. ClementeC. J. WeemsR. E. GrahamD. F. LamasL. P. HutchinsonJ. R. RubensonJ. WilsonR. S. HocknullS. A. BarrettR. S. LloydD. G. 2017 Detailed methods