[amibroker] US stock

["max_pare" <max_pare@xxxxxxxxx>]

Just downloaded "Stocks.zip 1.5mb" from "http://www.icc-az.com/"; go to "link" "Amibroker". I opened the database, and in markets I have NMS, NGM, UNK which seems to be NasdaqGS, NasdaqGM and NasdaqCM. Can someone tell be the difference between those 3 ? Thank you
Does anyone found that database useful ? Comment ? 

Thanks
Max



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