connecting boxplots

Hii,

I created some boxplots with this commands:

x <-read.table(file="test.txt")	
x$group <- rep(1:8, each=5)
boxplot(V3~gruppe, data=x) 

Now, I will connect the boxplots to each other to the min, max and median
values. 
Can anybody help me how to do it ?

greetings,
J

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