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...der.by=x) plot(y.zoo) and want to add a straight line like lines(x,c(2,2,2),col="blue") to the first panel. How can I achieve this? Performing the "lines" does indeed create a line, but puts it in the middle of nowhere. Thanks in advance Oliver -- Oliver Faulhaber ? Heckerstr. 2a ? D-68723 Schwetzingen oliverfaulhaber at gmx.de ? http://www.oliver-faulhaber.de