lists all tick types you can expect or request, Chris. Volume (#8) is a good overview of trade volume, but it only counts regular trades and does not include odd lots or any of a long list of "unreportable" trades.
You might find it helpful to also subscrive to "RT Volume" (#48) and "RT Trade Volume" (#77) as described in "RT Volume" includes "unreportable" trades while "RT Trade Volume" does not. Those two tick types return incremental volume numbers of recent trades.
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