Actually there was a time when I didn't know PU!
Can I give more info?
Here goes: Low speed side: lots of curved lines (a/s) beginning 1/3rd of way up the slide. Lower 1/3rd delineated by horizontal line with more Horizontal lines below it. (wind speed).
Ok, flip over the slide to high speed side. Now nothing but curved lines (a/s?) but no delineating horizontal line and lower 1/3rd for wind speed.
Is it because I'm from Birmingham?