Fig. 8.
ω-k dispersion diagrams of the pure transverse electric component (Ey) in the perpendicular direction. Each panel represents the result of the simulation with a certain ne/n0. The analyses are performed for the whole stage of each simulation case, which is 0–500 
with ne/n0 = 1% and 2.5%, and 0–300 
for the others. “R” stands for the relativistic mode branch.
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