Neutron flux + USRBDX

Dear fluka expert,
by using the USRBDX, I want to convert fluka result in lethargy field. fluka result of < x >*y is dn/d(logE). but i want to obtain dn/d(linE). how can i do this?

These are the lethargy units, which fit a logarithmic energy axis and binning (see slides 43-49 of the neutronics lecture).
If you want instead a dn/dE representation, select y (which is the FLUKA result as printed in the tab.lis and sum.lis files) and a linear x axis when plotting, as well as a linear energy binning in USRBDX prior to running.