Together, the results of Figures and indicate a potentially powerful way to interpret the optical properties of plasmonic nanoparticle materials. Changes in system parameters like volume fraction η or nanoparticle attraction strength U 0 , or even modeling parameters like level of moment truncation, affect structure-dependent resonant coupling and distribution of particle resonance frequencies cdf(ω res,i ). It is primarily through these changes in cdf(ω res,i )