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...1] ,type="l" ,xlab=colnames(mydata)[1] ,ylab=colnames(mydata)[i] ,main=colnames(mydata)[i]) grid(col="black",lwd=0.2,lty=1) } } HCHO <-read.table("qdoas.qdo", header=TRUE) maduplot(HCHO) ------ A sample dataset is attached. http://r.789695.n4.nabble.com/file/n3275655/QDOAS.qdo QDOAS.qdo -- View this message in context: http://r.789695.n4.nabble.com/Plot-colour-according-to-column-tp3275655p3275655.html Sent from the R help mailing list archive at Nabble.com.