Single patch from PSP observations. First panel: radial component of the magnetic field, B_R, and proton core velocity, v_R. Second and third panels: same as the first panel, but for the tangential and normal components, respectively. Last panel: T_p,∥ and T_p,⊥, where the colour-scale of T_p,∥ is the angle θ_RB. The verticaldashed lines indicate the times of the distributions plotted in Fig. 4.