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<div class="PlainText">Dear Colleagues,<br>
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The attached PDF is the revised paper after responding to the concerns of the PRL referees. I also attach the letter I would propose sending back to PRL to address the refereeās questions.<br>
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Please send me any comments or suggestions. as soon as possible or by Monday, December 12 at the latest.<br>
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Thank you.<br>
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Cheers,<br>
Douglas<br>
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26-415 M.I.T. Tel: +1 (617) 258-7199<br>
77 Massachusetts Avenue Fax: +1 (617) 258-5440<br>
Cambridge, MA 02139, USA E-mail: hasell@mit.edu<br>
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