Fig. 3From: Quasi-linear analysis of dispersion relation preservation for nonlinear schemesDistribution of Vg/c in the kΔx vs. ωΔt space for different spatial schemes. RK4 is used for the time discretization, and σ = 0.01. The green region represents the range 0.95–1.05, the red region represents the range > 1.05, and the blue region represents the range < 0.95Back to article page