Getting Volume from t6 data file

I am using data download from Zorro download page. It contains a column with volume. I would like to retrieve the volume values but I cant seem to figure out how. I tried using markerVol() and marketVal() with no success. Lean flag is not set. Any suggestions?

I think if you want to access volume you need the "S" edition.

Thanks for your response. I did see that in the manual as well but it is a bit vague because it mentions using tick data. My guess is that you are probably right. A workaround this would be to duplicate the asset and put the volume column as one of the price fields and save it and then access it as another asset...