Abstract
We are grateful to Bruno Macke of the University of Lille for calling to our attention several errors in the equations of our paper 1 . These errors do not appear in the final results of our calculation nor do they influence the conclusions of our work, but they could present a problem for someone attempting to reproduce the details of our calculation. These errors are as follows. The last term of Eq. 4 should read +f 2 / 2 instead of −f 2 / 2. Also Eq. 12 should read
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