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Adding table of contents.
Corrected a few typos.
link to contour shifting
Replace the link to non-existing article to link to the "Make everything roughly of the same size" article.
Another typo...
Correct a few typos.
Maths markup changes.
The markup for displayed formula was incorrect: update.
First draft version translated from http://blogs.ethz.ch/kowalski/smoothing-sums-wiki-page/
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Tricki