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\caption{(Placeholder (Placeholder  Image): \label{fig:particletypes} Particle types considered in this paper: (a) 3DOM (radiative properties taken from \cite{Wheeler_2014}\cite{Randrianalisoa_2014}, (b) randomly porous particles (radiative properties calculated herein), (c) a sphere made of an effective medium (radiative properties calculated using VAT and Lorenz--Mie theory.)} theory.)