The joint distribution of the values of the normalized cross-helicity σ _C and the normalized residual energy σ _R within two heliocentric ranges: close to the Sun (R ∈ [0.1, 0.3] au) and far away (R ∈ [0.6–0.8] au). The color bar is the percentage ratio between the counts in each bin and the total number of calibrated (good quality) data points.