Would like to point out here too: Using XY(scatter) plot is the main issue here, I think. Note that in creating a diagram, you can tweak what field is used for labels, X- or Y- values (combining multiple columns with a ";" between them is easy too), though that might get more complex than you'd like
bosyber ( 2012-05-10 17:33:14 +0200 )edit

Do you mean that you want all the data to be seen as a single data set in the plot, or as two separate series? Pedro's answer gives you the second. In both cases: use XY(scatter) plots when you have a real dataset where x is more than just a counter, it gives better results.
bosyber ( 2012-05-10 17:22:28 +0200 )editDo you mean that you want all the data to be seen as a single data set in the plot, or as two separate series?
bosyber ( 2012-05-10 17:22:28 +0200 )edit