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...- ci[s] * x.stats$se[s], s[s], x.stats$mean[s] + : zero-length arrow is of indeterminate angle and so skipped What does that mean and how can I get rid of it? Any ideas? Thanks a lot, fussel -- View this message in context: http://n4.nabble.com/Error-message-when-using-error-bars-x-add-TRUE-tp1560278p1560278.html Sent from the R help mailing list archive at Nabble.com.