Modeled ion energy distributions for three solar wind scenarios (S1, S2, S3) with a phase space resolution of oMPIC = 3 (left panels) and oMPIC = 15 (right panels). Panels a and d present the distributions obtained using the simple sphere method, while panels b and e used the omnidirectional particle accumulation technique, and panels c and f show the filtered FOV distributions. The solid lines denote the sample mean values within each energy bin, with shaded intervals representing the 95% confidence range.