Plots of apatite (U–Th–Sm) /He ages against crystal size. Long-term evolution of the West African Transform margin: Estimates of denudation from Benin using apatite thermochronology. WildmanM. WebsteD. BrownR. ChardonD. RoubyD. YeJ. HuygheD. Dall'AstaM. 2018 File 3a: Plots of apatite (U–Th–Sm) /He ages against crystal size.