[R] ploting dots with quentiles

[kexinz]

http://r.789695.n4.nabble.com/file/n2260087/%E6%8D%95%E8%8E%B7.png 

I am going to plot my data set like this, with means and 25% & 75%
quentiles. 
I've tried "boxplot", but the output is not what I want. Should I use other
functions? Thanks 
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