:Thanks for all of the "tweaking." Assuming that the table works OK on all browsers, I think the only remaining issues are: 
 :# The main table is still a bit wider than it needs to be.  I will go hunting for unwanted whitespace this evening (delete sections of table, see if it shrinks in width). 
 :# The 100 vs 101.3 kPa is still an issue as far as I'm concerned- I'm not going to assume that our page on SATP is correct.  I've noticed that nearly all the ref. books and tables refer to 25 C and exactly 1 atm, so if we fix it at 100 kPa we won't have much info available!  I'd like to verify things one way or the other in books as well as websites before we put the table up. 
 :# The supplement page- as far as I'm concerned we can still edit this for another day or two if need be, though I plan to put up our Monday version as a template.