Fig. 3: Comparison of different model predictions for multipole proton radial densities of 246Fm and 254Fm.
From: Smooth trends in fermium charge radii and the impact of shell effects

a–d, Monopole radial densities (a), r4-weighted difference between monopole radial densities of 254Fm and 246Fm (b), quadrupole radial densities (c) and hexadecapole radial densities (d). The maximum range of model predictions is marked by bands in a, c and d; the solid lines represent the average of the models.