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We investigate the transmittance of fixed-length ensembles of spherical particles having average radii ranging over two orders of magnitude. The transmittance is interrogated at discrete frequencies in the terahertz regime where the particle radius is subwavelength by at least an order of magnitude. A nonmonotonic dependence of the transmittance on particle radius is observed. As a function of increasing particle size, the transmittance increases to a peak value and then decreases toward zero.doi:10.1063/1.3430547 fatcat:2soq3e3cabg2neovhzxpytt62q