Don't worry if you don't. Setting the correct rows and columns on the grid sop will fix that. You should see the heights lowered. Perhaps you'll want to lower them some more. The picture is corrected in the next step.
Chops make it easy and visual.
With Chops, Columns of numbers are imported as individual animation channels. Bits of geometry can then be re-written with these channels. There's 2838 points in aust.chan, but 4000 points on the 100x40 grid. So let's make the grid smaller. The ridges should move about.