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Public Reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comment regarding this burden estimates or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for informationdoi:10.1364/oe.15.007146 pmid:19547033 fatcat:mrfwtw6ctrhitpgcxtn3mm7mau