Hi Henrik, I am having the same problem with lty. I do not understand how you solved it using unlist. Were you able to solve it modifying the lty? Cheers, Juan -- View this message in context: http://r.789695.n4.nabble.com/Line-Type-Specification-lty-on-off-but-lty-off-on-tp2970669p3091707.html Sent from the R help mailing list archive at Nabble.com.