1. What do the following attributes mean? tickAttribLast.PastLimit tickAttribLast.Unreported 2. Where can I find a definitive list of all Exchange codes that may be returned (e.g. FINRA, DRCTEDGE, ISLAND, etc) 3. Is there any documentation specifically on the return type of specialConditions. I have seen https://www.interactivebrokers.com/en/index.php?f=7235, but I would prefer to code against documentation for the API rather than try and reverse engineer or guess what may or may not be returned. Thanks.