[R] Problem with x labels of barplot

[Don]

Hello everyone,
i am currently creating a barplot.
This barplot takes a vector of ~200 datapoints. 

Each datapoint represents one bar.
http://img96.imageshack.us/i/human1w.png/
(Ok as you see, it is not only one barplot, but a series of barplots).

Now, these barplots represent a human chromosome. This means they are
ordered. For instance bar number 50, means position 50 in the human
chromosome. I would like to have x-axis labels showing this. 
0.......................50..........................100.......................150........................200...................250
Yet i do not know how to accomplish this.
If you use the normal plot function, these numbers on the xaxis are
autogenerated, in case of a barplot, they are not, and i do not know how to
create these labels.

I would be happy about a solution.

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