plotting 2 sets of data on the same scatter plot using 2 symbols

Hi

I have had a mental blank. I an trying to show data from two sets on the one scatter plat using different symbols. Have attached the data. Each paired point is an XY coordinate, and I need the 'surface' points to look different from the 'subsurface'. I know this will be simple, but its been a while since Ive done it. Any help appreciated.
Regards
D.