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...this code but I don't know how to draw the two lines.. Can anyone help me please? Thank you very much Pippo http://r.789695.n4.nabble.com/file/n3394476/exponential_smoothing.pdf exponential_smoothing.pdf -- View this message in context: http://r.789695.n4.nabble.com/Exponential-distribution-tp3394476p3394476.html Sent from the R help mailing list archive at Nabble.com.