How to make XY plots in Numbers

[ssls6]

This should be so simple but I'm really struggling to figure out how to make a simple XY plot from two columns of numbers. I've tried using the scatter function with and without "shared-x" toggled. Neither is correct. I have imported XY plots from Excel and then Numbers deals with them correctly but making a new XY plot is beyond me.

Anyone out there who knows the trick to making an XY plot?

 

[dyt1983]

edit: To remove personally identifying information not relevant to the thread. And remove dead picture link.