First go to
http://www.lns.cornell.edu/rbin/ccon3/Cleo3ConstantsWeb.pl
You will get a form that looks like the screen shot below.
1) To get specific constants for a specific run number:
You will get something like:
2) To get a list of versions:
You should get a pop-up window that looks like this:
3) To get a list of Meta-Versions for a given version:
You will get: