Electron peak intensity spectra measured by Wind (1), Solar Orbiter (2), and STEREO-A (3). The legend shows the fit values: the spectral index (δ₁, δ₂δ₃) observed in between the spectral transitions: E_b; and α (β), which determines the sharpness of the break(s) (Strauss et al. 2020). The lower and fainter set of points correspond to the pre-event background level. Details given in the main text.