Electron 300–800 keV intensities observed at 0.31 au by Helios-1 (solid black curve). Intensities expected at 1 au (blue curves) assuming the same interplanetary transport conditions and the same injection histories deduced for Helios-1 scaled according to a Gaussian distribution centered at the source region (see text for details). Electron 220–800 keV intensities observed by IMP-8 at 1 au (black diamonds).