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In the original article the author has remarked a minor mistake on page 169, which changes the result displayed in eq. (6), but does not affect any of the conclusions of the paper. In line 13, the exponent n is to be changed to n /2. Consequently, in all following expressions ln b is to be multiplied by 2 wherever it appears. Equation (6) thus reads
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S Herminghaus (2007) studied this question.
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