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It was found that value [[psi].sub.c] = 45[degrees] was suitable for techniques Gd, SC, C, EGd, and TEGd, and value [[psi].sub.c] = -22.5[degrees] was suitable for technique G.
The only techniques in which the error is small and stable for all sufficiently large intervals of offsets are Gd, C, and TEGd.
The techniques of higher quality, Gd, C, EG, TEG, EGd, and TEGd, show better results because they are based on nonlinear equations; the higher the nonlinearity of the base equation (the cubic technique C) is, the better the results are.