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The dispersion branches for the SRR structure. Results from numerical simulations shown as solid lines, the asymptotics as dashed line and the light-line is dotted. (a) Is for a large SRR of outer radius Rout=0.95 and inner radius Rin=0.85 and (b) is for a smaller SRR with Rout=0.4 and Rin=0.3.
