In order to characterize the significant energy range for each GCR nucleus, we have calculated the most harmful kinetic energy (top panel), the kinetic energy required to achieve 99% of the net absorbed dose rate (middle panel) and the kinetic energy required to achieve 1%. Each panel contains 14 scatter graphs corresponding to the seven phantoms indicated with different symbols and two levels of solar activity, indicated with two colors. For example, crosses with blue lines are for the H₂O slab at solar maximum (ϕ = 1500 MV). Limiting our simulation to the energy range [E _1%, E _99%] would result in a underestimation ofthe absorbed dose rate of the order of 2%. Important data presented here has been summarized in Table A1.