Figure 3. Attenuation in Cu (Z = 29), represented by Im (f) = f₂. [µ/ρ] (in cm²/g) = f₂ (e/atom) × 6.622 02 × 10⁵. Experimental data from Saloman, Hubbell and Scofield [34]. Chantler [16], Scofield theory and even the smoothed structure of Henke et al. [32] agree with uncertainties of available experiment. In this case, the qualitative near-edge structure is the same for all tabulations, except for the apparent offimmion of the L_III edge in the Henke curve.