[R] multiple series on same graph

[Collin Carbno]

I'm trying to duplicate some graphs from powerpoint in R package.  One
of things I'm having trouble with is I don't understand how to use the
points command to create different sets of points with different color
and marking attributes, and a legend on the graph.  Where should I look?
I can't seem to find an example of two different sets of data on the
same graph.

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