Relative difference between the original SCO-RCG RMO (κ_R, orig.) and the calculation with the OP frequency mesh (κ_R, 10k) in the (T, N_e) plane, plotted according to the same scale. Its upper limit is set to 5%. The dark red parts are to be considered as lower limits. From left to right, the panels show the results with the mean of the inverses of the cross sections, the mean of the cross sections, the sampling of the inverses, and the sampling of the cross sections.