R-beta: plot with error bars?

[Bill Simpson]

I have read the Venables & Smith Notes on R.
I was wondering if someone could tell me how to make an XY plot with error
bars.
1. x holds x values, y holds y values, ci contains confidence interval
(error bar stretches from y-ci to y+ci)
2. x, y, ucl contains upper confidence limit, lcl contains lower
confidence limit.  Error bar stretches from lcl to ucl. Need this for
asymmetrical error bars.

Thanks very much for any help.

Bill Simpson

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