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Mean hinge angle a (vertical axis, scale 0–50°) and its standard deviation (cross-bars) for the 10 central junctions of the four oligomers (that is, X3pY4, at the top of the figure, through X12pY13 at the bottom) and for three bending angle regimes (weak: 0–50°, medium: 50–100°, strong: 100–150°). No values for [AT] are given beyond 80° due to base unpairing at one end and the breakdown of the bending restraint.
