JGL,
Thanks for the explanation. I knew what the 1.41 and .707 were, but the .637 threw me. Then Stan didn't say anything about it in his post so I thought it was something I hadn't seen before. Probably didn't want to over complicate things there. Anyway, I didn't know some of the details you explained, so I know more than I did. And that is what usually what happens when you ask questions around here! Lots to learn and this is the place to learn it. Thanks again.
Edit:
Woops! Guess I was too slow in composing my post. Now I see why Stan didn't say anything above! Thanks Stan, now I have learned even more and this is all new for me, never heard of this before. I better save this one. Thank you for explaining it to us!