[R] a high-level command for drawing a multiple series graph with each series having a label

[Mark Farnell]

I wish to draw a graph representing multiple series (sets of x,y
points).  Each series has its own label and points within each series
are joined by a line ordered by their X cooridnate.

I would also like a legend automatically showing which each series is.

Which high-level command can serve this purpose?  I looked at my book
but can't find such a command.

Thanks!

Mark