Energy dispersion matrices of the cos(θ) ∈ (0.9, 1.0] incidence direction bin for FRONT and BACK events. True and measured energies are shown on logarithmic scales. The figure shows how flux from each true energy is distributed to the observed energy bins by the measurement process and has a logarithmic color scale. The white rectangle marks the EDF matrix entries used in this work, which were selected based on the studied energy range.