r-plot

Dear R-community

I have a grueling problem which appears to be impossible to solve:
I want to make a simple plot, here is my code: http://gist.github.com/118550
Unfortunately, the annotation of both the x- and y-axis are not correct, as
you can see in the following picture: 
http://www.nabble.com/file/p23739356/plot.png 
I am not an expert of R, so maybe someone can point me to the solution of
this problem, i.e. both of the axes should start and end at the min / max
values of the two vectors.

Thanks in advance!!

Best,
Durden

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