Time evolution of the perpendicular (f_e(v_⊥e)) and parallel (f_e(v_∥e)) electron VDFs. The dashed green line corresponds to a Maxwellian fit at t = 0, while the dashed black line corresponds to a Kappa distribution fit (e.g., C. S. Salem et al. 2023) at ﹩t=1.5{\tau }_{{\rm{\exp }}}﹩ with parameter κ = 6.2 for f_e(v_⊥e) and κ = 5 for f_e(v_∥e). The solid blue line indicates the electron VDF at ﹩t=0.5{\tau }_{{\rm{\exp }}}﹩ (onset time of expansion). The insets show the time evolution of the electron VDF at a fixed speed v* = {2.0, 2.5, 3.0}v_the0 associated with the vertical dashed lines displayed in their respective main panel.