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Correlations between the contact dielectric boundary forces computed at the grid spacings of 1/2 Å, 1/4 Å, 1/8 Å, respectively, and those at the grid spacing of 1/16 Å for the model helix. Top: no approximation. Middle: normal field approximation. Bottom: no approximation at 1/16 Å. The correlation the between total field and normal field approximations at the grid spacing of 1/16 Å is shown at the bottom panel. Unit: kcal/(mol·Å).
