Inverse solution to particle flux (top) and anisotropy (bottom) of three observers (left: STA/SEPT, middle: Solar Orbiter/EPT, right: Wind/3DP) for ∼314 keV electrons. The observed particle fluxes and anisotropies are depicted in blue and the simulated ones in red. The solid gray line in the flux profiles indicates the background level and the dashed line the background level plus 3σ. Simulated anisotropies have been reversed for Solar Orbiter and Wind, which were in an opposite polarity HMF to STEREO (see Fig. B.1 in the Appendix).