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Numerical dispersion relation in 2D (2)
\frac{\tilde c}{c} = \frac{1}{Ckh}
\sin^{-1}\left(C\left(\sin^2 ({\half}kh\cos\theta)
+ \sin^2({\half}kh\sin\theta) \right)^\half\right)
Can make color contour plots of 1-\tilde c/c in
polar coordinates with \theta as the angular coordinate and
kh as the radial coordinate.
