LEED intensity measurements and dynamical calculations have been performed for the nonreconstructed Ir(100) surface. They were compared with each other using the Zanazzi–Jonarfactor for different energy ranges of the spectra, i.e., 100–250, 250–500, and 100–500 eV. It turns out that the surface relaxation is always nearly the same, at least within the error of the fit, Δd/d=−2%±2%. However, it appears that therfactors are definitely lower for the high energy region accompanied by a slight increase of the precision with which Δd/dcan be extracted. The Zanazzi–Jonarfactor of the total energy range cannot be interpreted as a linearly weighted average of those of the subranges.