(color online) 2D pseudocolor plots of (logarithm–ic scale) for spherical nanoparticles as functions of and with (a) and (c) . Here the radius of particle is R = 65.1 nm. The dashed-dotted lines in panels (a) and (c) denote these points where the real parts of permittivities are zero. The optical cross sections and Mie coefficients each as a function of for spherical nanoparticles with (b) , , and (d) , . Abbreviations for resonances: , magnetic dipole; , magnetic quadrupole; , magnetic octupole.