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My blog article http://blog.sciencenet.cn/home.php?mod=space&uid=1565&do=blog&quickforward=1&id=495058 posted 10/10/2011 contained a calculation error on slide #9 of the PowerPoint document which did not effect the conclusion on slides 8-10. An alert reader Dr.李江海 [lijianghai@tsinghua.edu.cn] of Tsinghua caught the error and brought it to my attention. I thank him for his thoroughness and care. The article now contained the corrected slide #9.  Readers who have dowloaded the ppt document earlier should re-download the newly posted document to avoid further propagating the error. Thank you for your attention.

(Note added 11/8/11: Dr. Li asked me to add that he had help from Chaobo Yan, the PhD studentof Prof. Zhao, and
Biao Sun, the PhD student of Prof. Luh, of CFINS Tsinghua in checking this error and the correction. I commend him for such ethical behavior of giving credits.)