a metering roll positioned to contact {HEAD ~ grain} advancing out of said discharge opening of said grain column, wherein said {TAIL ~ metering roll} has a vane diameter equal to VD, and VD≧6.0 inches 
a metering roll positioned to contact { HEAD ~ grain } advancing out of said discharge opening of said grain column , wherein said { TAIL ~ metering roll } has a vane diameter equal to VD , and VD≧6.0 inches
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH