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Second, breakpoints are sampled uniformly from the interval [0;1[, resulting in relative length fractions for all fragments. Third, relative fragment sizes are transformed from unit space to sizes that follow a Weibull distribution of shape by:
where is a constant of the transformation to ensure that the sizes of the fragments sum up exactly to the given molecule length. Latter transformation produces a slightly distorted Weibull distribution for the sizes , however the deviation is sufficiently small to be neglected in our applications.