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           An Xmgrace Tutorial  http://mintaka.sdsu.edu/reu/grace.tutorial.html#toc1
           Grace Tutorials £¨¸öÈ˾õµÃ·Ç³£ºÃµÄ£© http://plasma-gate.weizmann.ac.il/Grace/doc/Tutorial.html
           Grace/Xmgrace (Xmgr)    http://math.nyu.edu/aml/software/xmgrace.html
           Grace User's Guide     http://plasma-gate.weizmann.ac.il/Grace/doc/UsersGuide.html

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