Regarding the FX RIC's, What is the difference between "THOMSON REUTERS CALCULATED" and "THOMSON REUTERS SNAPSHOT"?
The Thomson Reuters calculated is a calculation based on the two currency pairs against the USD ie CZKNOK=R is the calculation between CZKUSD and NOKUSD. We usually do this because there are not enough actual quotes in the currency pair.
The Snapshot (=X) is a ten minute snap of a particular currency pair. Whereas the calculated will update as and when the two currencies in the pair update.