hi L i didn t put those last two in with the log cos stuff it didn t come from Gilson AFAIK you ll have to check the article history the diffs to figure out who put it in you can yank it out AFAIC and see if someone squawks or not i won t or you can track down the editor who stuck it in and ask them about it or you can yank it out and tell that editor or any other combination BTW G is accurate to 150 ppm where that number above is 42 ppm better than G but not much better nonetheless we know to about 3 ppb and Gilson s numerology is accurate to about twice that error