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. 2003 Jan 28;100(4):1679–1684. doi: 10.1073/pnas.252753899

Table 2.

Coefficients of the hydrogen bond term

λ1 λ2 λ3 α1 α2 α3 α4 α5
|(ji) < 13| 1.79 3.05 0.0 −0.74 0.54 0.60 0.42 0.0
|(ji) ≥ 13| 1.62 3.47 4.09 −0.74 0.93 1.02 0.42 2.31

All data are given in units of ɛ. The zero values for λ3 and α5 indicate that the parallel sheet interaction is turned off in the intermediate range proximity class.