Can you quote the language in my post that discusses the difference between 102.6 and 102.8? I did no such thing. Sorry my post was too simplistic and incomplete for you. Perhaps that was because, as you previously stated, the subject had already been discussed to death in another thread. Were your posts among those that discussed the matter to death in that thread? I didn't need you to spell out what I already knew and understood full well. But if it makes you feel better, let me congratulate you on the depth of your understanding of geophysics. I yield to your obvious credentials. Can we now put a period on this interchange?