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(a) Experimental polarized reflectivity levels for the 1- and 2D plasmonic black metals (Au, Ni, and Pd) averaged over the wavelength range 400–985 nm (773 CCD pixels) for each spectrum in Figs. 1,2,3,4, and Supplementary Figs. S1–S2. The last Au column is reflectivity averaged over the indicated sub-ranges.
