Simulated Jovian electron spectra used to optimize the values of λ_∥ and χ. Top panel:a data fit (dashed line) along with the simulations results and spacecraft data obtained during corresponding time periods at the longitudinal point of best effective magnetic connection for different values of λ_∥ = [0.05, 0.4] AU. Panel b does not show the simulated spectra for different values of for different values of χ = [0.005, 0.045] in the upper panel as the simulations are performed utilizing two different values for λ_∥. The fit (dashed line) was performed utilizing spacecraft data by ISEE 3, the only spectral data formagnetically poorly connected observation times as given by Table 1. Lower panels: corresponding relative deviations from the fit (dashed lines) together with the ± 0.5 deviation area given in shaded grey and the spacecraft data. Lowest panel: shaded area marks the range of values for λ_∥∕⊥ within the margin of less than ± 0.5 relative deviation.