Radial gradients of ACR helium are shown as a function of energy between 11.1 and 49 MeV/nuc. The blue points are the fitted results as in Fig. 4 and the orange squares further exclude the GCR contamination which are estimated from the BON2020 model, accompanied by their error bars. The grey circles represent the radial gradients obtained from PSP (Rankin et al. 2021). The dashed lines are the averaged gradient over the corresponding energy range.