Examples of proton distributions measured by SPAN-Ai during the patch shown in Fig. 3 where each row corresponds to the times indicated. Each column gives a cut of the measured proton distribution in the proton core bulk frame, i.e. the core is centred on (0, 0). For example the left column is a cut through the distribution in the v_∥-v_⊥,1 plane at v_⊥,2 = 0. We also include our bi-Maxwellian fits as contours, showing overall good agreement with the distributions.