log₁₀T vs. log₁₀n of solar wind electrons, as derived by (left) statistical moments analysis and (right) fitting analysis of the first 100 3D-VDFs obtained in 15-06-2020. The magenta dashed lines in each plot are isobaric lines. There is a clear anti-correlation between log₁₀(T) and log₁₀(n). However, the small value of the slope describing the relationship between the observables, indicates a nearly isothermal electron plasma. The statistical error bar in the left panel is not shown as it is comparable to the data symbol size.