Measurements of fast solar wind ion temperatures inside 1 AU. Top panel: perpendicular (triangles) and parallel (circles) temperatures for protons (blue), alpha particles (green), and oxygen ions (orange). New results from this work are alpha particles at large distances. The T_H⁰⊥ values close to the Sun are from the polar measurements in Fig. 2 of Dolei et al. (2016). The T_O⁵⁺⊥ values are from Fig. 5 of Cranmer et al. (2017), originally reported by Cranmer et al. (2008).