Electron velocity distribution functions. Representative VDF for the evolution from a solar wind-like VDF (blue curve) to accelerated VDFs (black and green curves). A generalized Gaussian (Eq. (1)) is used to fit the non-Maxwellian suprathermal distribution. At high electron velocities, the distribution resembles a Maxwellian part and then a power-law dependence (purple and cyan curves). Error bars are reported (Poisson statistics), but they are smaller than the marker size.