"Anyone know what the "g" marker indicates....
...
g 3.429 65600 16:17:04 ..."

Had a bit of problem finding that one. I suspect it's a fairly new marker code. Several help documents I looked at, didn't include the g marker. But the following web page shows it:

http://www.stockwatch.com/stocks/stocks_helper.aspx

That page says it signifies a "VWAP trade" and it explains it like this:

"A transaction for the purpose of executing trades at a volume-weighted average price of the security traded for a continuous period on or during a trading day on the exchange. VWAP trades are included in the volume, value, and transaction totals but do not affect open, high, low, last sale, and close prices."