Fig. 2From: Quasi-linear analysis of dispersion relation preservation for nonlinear schemesDistribution of Vg/c in the kΔx vs. ωΔt space for different time schemes at different σ. UPW5 is used for the spatial discretization. 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