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On the character of the thermodynamic properties distribution in DNA molecules inside the melting interval.

The variances of the distributions of DNA molecules over the degree of helicity and over the number of unwound regions inside the melting interval are calculated. The variance over the degree of helicity is expessed in terms of the values directly available from the experimental data. For the variance over the number of unwound regions a simple interpolation formula based on the machine calculations is proposed. Possible applications of the results obtained to interpolaation of the electron microscopic denaturation maps of DNA are discussed.