Modified Finite Difference Schemes on Uniform Grids for Simulations of the Helmholtz Equation at Any Wave Number

Table 6

Comparison of the dispersion error for standard central (3) and modified central (10), standard forward (19) and modified forward (21), and backward (20) and modified backward (22) finite difference schemes for fixed with varying wave numbers for the case of radiation boundary conditions (34).

	Scheme (3)	Scheme (10)		Scheme (3)	Scheme (10)
	Scheme (19)	Scheme (21)		Scheme (19)	Scheme (21)
	Scheme (20)	Scheme (22)		Scheme (20)	Scheme (22)