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...xyplot(y~time|id, data=dat,type='l', panel=function(x,y,subscripts,...){ panel.xyplot(x,y,subscripts,...) panel.abline(v=dat[subscripts,"cm1"]) panel.abline(v=dat[subscripts,"cm2"]) } ) Since I don't know what the dataframe 'mergeData' is I have used 'dat'. Best regards Frede Aakmann T??gersen Scientist Danish Institute of Agricultural Sciences Research Centre Foulum Dept. of Genetics and Biotechnology Blichers All?? 20, P.O. BOX 50 DK-8830 Tjele Phone: +45 8999 1900 Direct: +45 8999 1878 E-mail: FredeA.Tog...

...3 2 4 4.5 1.2024161 13 3 3 4 4.5 0.1784666 14 3 4 4 4.5 -1.3260668 15 3 5 4 4.5 -0.2711263 I would like to plot y against time with a panel for each id, i.e. with something like xyplot(y~time|id, data=dat,type='l') or xyplot(currCow.mean~currCow.cm|cowid, data=mergeData, type='l', panel=function(x,y,...){ panel.xyplot(x,y) } ) Then, I would additionally like to have two vertical lines in each panel, and these are defined by cm1 and cm2. My understanding of xyplot is that id will give a partitioning of data into subsets, so I expected to be able t...