Since market is talking about 10-year treasury notes and I would like to know more about it. I'm using IB. I can get quote for TNX, but not able to backfill it. So I'm confused. Here is my question. Is TNX an index, like OEX? If yes, why I can backfill OEX but not TNX? How TNX (10 YEAR US TREASURY NOTE index) is calculated? And How ZN (10 YEAR US TREASURY NOTE futures) is calculated? And what's the relationship between TXN and futures contract ZN? Today TNX close at 51.63 & ZN (Sep 07) closed at 104'240 Anyone able to enlighten me? Thanks!!!