I have a program called LinkCAD by Bay Technology 831-688-6435.  It is
expensive but they offer a month or so for free trial.  It works OK so far.

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Glen A. Landry, Ph.D.
Naval Research Laboratory
Materials Physics Branch
Code 6340
4555 Overlook Ave. SW
Washington, DC 20375
USA
Tel.: 202-767-4474 Fax: 202-767-1697
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