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Yukawa-segment pair potential for two segments of length Lp as a function of the mutual azimuthal orientation angle φ of two DNA molecules, at fixed interaxial separations as indicated in the legend, for θ = 0.9 and θ = 0.7. f1=0.3, f2 = 0.7, and f3 = 0 were used for the fractions of condensed counterions in the minor and major groove and on the strands, at different interaxial separations, as indicated in the legend.
