[R] is there any graphic function

hanen
Wed, 14 May 2008 21:04:16 -0000

hello:

is there any graphic function under R that allow me to add an interval on
the graphic's picture at any place i want.
i mean by interval the symbol "|----|"  showed verticaly and has as
middle
the point M with coordinates (yi,ti).please answer me as soon as possible.
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