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PhotoArchive images may be used for personal, noncommercial purposes. These include the preparation of course or instructional materials by teachers and students which are clearly not for profit. Express permission for such uses is not required. However, please include the following credit line wherever an image is used: COURTESY OF CLEMSON UNIVERSITY AND (NAME OF PHOTOGRAPHER). In all cases except where explicitly noted, the photograph is the property of Donald D. Clayton, whose name would be used in the Acknowledgement. Permission is also granted for publication in scholarly manuscripts and textbooks. No rights are granted for other COMMERCIAL projects. For those explicit permission must be obtained in writing or email from Donald D. Clayton, Department of Physics and Astronomy, Clemson University, Clemson SC 29634-1911. Email to


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