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...panel.abline(v=08/08/2008) }) I'd expect a vertical line in the date 08/08/2008 but nothing is drawn. Also, I tried with an horinzontal line got no result... Any help please?? Thanks -- View this message in context: http://r.789695.n4.nabble.com/Add-lines-to-xy-plot-with-temporal-x-axis-tp3771217p3771217.html Sent from the R help mailing list archive at Nabble.com.