[R] how can I plot the histogram like this using R?

[bbslover]

 Thanks for your reply, I just want to get the figure like y1.jpg using the
data from y1.txt.
 Through the figure  I want to obtain the split point like y1.jpg, and
consider 2.5 as the plit point.  This figure is drawn by other people, I
just want to draw it using R, but I can not, so I hope, friends can help me.
 
Best wishes!
kevin http://n4.nabble.com/file/n1965378/y1.jpg 
http://n4.nabble.com/file/n1965378/y1.txt y1.txt 
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