======= Date Modified 24 Feb 2010 16:19:49 =======
That's fine as long as you reference it. If you've changed anything yourself during drawing, you can writre "modified after Smith et al. 1998" - I did this in my thesis and it was fine, so no, shouldn't be classed as plagiarism. (up)
If it's for a journal or something you want to publish I don't think you're allowed, but def. just for your thesis or a presentation it's fine as long as you reference.