The values of writhe of the tightest conformations, found by the SONO algorithm, of all alternating prime knots with up to 10 crossings are analysed. The distribution of the writhe values is shown to be concentrated around the equally spaced levels. The “writhe quantum” is shown to be close to the rational 4/7 value. The deviation of the writhe values from the n(4/7) writhe levels scheme is analysed quantitatively.
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