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- 20:43, 29 December 2015 Martijn.wetering (Talk | contribs) uploaded "File:Savitzky golay example.png" (This is an example output used on the page http://wiki.hevs.ch/R/index.php5/Functions/Salitzky-Golay-filter-example red: original sine function black: sine function after adding noise green: after filtering blue: derivative )