Excel should be able to produce probability plots with the probabilities
distributed symetrically about the mean. Normal and lognormal
quantile-quantile paper showing this may be found at:

http://www.weibull.com/GPaper/index.htm
http://www.reliasoft.com/pubs/paper_normal.pdf
http://www.reliasoft.com/pubs/paper_lognormal.pdf

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