a grain column through which grain may flow, wherein said grain column includes a left lateral discharge sidewall, a right lateral discharge sidewall, a lower discharge surface and an upper discharge surface which collectively define a discharge opening, said lower discharge surface is spaced apart from said upper discharge surface by {HEAD ~ a distance} equal to {TAIL ~ D1}, and D1≧5.0 inches; and 
equal to
a grain column through which grain may flow , wherein said grain column includes a left lateral discharge sidewall , a right lateral discharge sidewall , a lower discharge surface and an upper discharge surface which collectively define a discharge opening , said lower discharge surface is spaced apart from said upper discharge surface by { HEAD ~ a distance } equal to { TAIL ~ D1 } , and D1≧5.0 inches ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH