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Correlations between the contact dielectric boundary forces computed at the grid spacings of 1/2 Å, 1/4 Å and 1/8 Å respectively, and those at the grid spacing of 1/16 Å for the model helix. Top: Gilson et al. Middle: normal field approximation. Bottom: the correlation between Gilson et al. and normal field approximation at the grid spacing of 1/16 Å. Unit: kcal/(mol·Å).
