Steffensen’s method applying . Dynamical planes when changes along the circumference of radius 1. https://damres.webs.upv.es/wp-content/uploads/2017/11/STF2.mp4 By Francisco Israel Chicharro Biparametric family of Ostrowski-Chun on quadratic polynomials. Dynamical planes for and different values of . https://damres.webs.upv.es/wp-content/uploads/2017/11/JG.mp4 By Javier García Maimó