plotting data using bars

Hi,

I'm sure it's an easy question but right now I'm stuck with the following problem and can't find out how to solve it:

I have xy-data-sets (a few hundred data points), whose x-values are not evenly distributed, e.g.:
1 y1
3 y2
8 y3

How can I plot this data set so that it finally looks like the blue bars in http://www.wavemetrics.com/products/igorpro/gallery/userpix/friedman.gif ?

If I use an xy-plot with Modify Graph mode = 5 I end up with bars, but they are connected to each other which is not what I want. I have not found out yet how to change it (if possible). Also, it's not really a category plot.

I already tried to search the documentation, but end up with a lot of information on error bars and category plots. Any help is appreciated!