> that extraneous white lines in PDFs are the fault of the PDF > viewing program rather than of R.
Except it's a PNG file. I've tried to minimize artifacts viewing PDF files. But assumed (falsely?) that PNGs and other raster formats, would be fine. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.