On Apr 26, 2010, at 7:53 PM, solarwind wrote: > Can anyone explain the behaviour around 1 micrometers - 10 > micrometers? http://www.phys.hawaii.edu/~anita/web/paperwork/currently%20organizing/Military%20EW%20%20Handbook%20Excerpt/rf_absor.pdf Water appears to be the main culprit. We have a vert convenient atmosphere! BillW -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist