Pioneer 10’s CPI counting rates of the 7–17 MeV electron channel (blue), are displayed together with theresult of an exponential background fit (black with a gray shaded region showing a 1 σ uncertainty). In order to estimate the increase of the electron flux in the Jovian jet used to determine the Pioneer spectrum by Teegarden et al. (1974; shaded in red) all other jets identified by Dunzlaff et al. (2009; green) were also excluded from the background, along with the fluxes obtained inside the Jovian magnetosphere (orange).