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Components of the potential of mean force in bringing two helices together. The helices are shown in green and the parallel (blue △) and antiparallel (red ○) arrangements are indicated by the arrows. Wsolv is the solvent contribution (open symbols), and Wsolv + ΔU (eq 3) is the net PMF (filled symbols). For r ≲ 8 Å, there is steric overlap between the helices and ΔU rises rather sharply. Data including these values of ΔU are thus not shown.
