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...consideration. Specifically, how can I modify the specifications in the command to produce the correct pch type in the legend as in the chart itself? Thank you very much in advance for your kind advice. Best Lin -------------- next part -------------- A non-text attachment was scrubbed... Name: trydatafigure.pdf Type: application/pdf Size: 13614 bytes Desc: not available Url : https://stat.ethz.ch/pipermail/r-help/attachments/20061216/c233eaae/attachment.pdf