I think it was NYARTCCFAN that was asking me about Chicago Center high altitude frequencies ? For anyone interested, below is a map I put together showing the current sectors and frequencies. The frequencies have been verified by listening over the last couple of days. The floor/ceilings of each sector are my estimation based on what I've heard. If anyone can provide an official reference or have any updates or corrections it would be appreciated.
DJ
edits to map: 127.775 changed to 118.425