The grain column includes {TAIL ~ a left lateral discharge sidewall}, {HEAD ~ a right lateral discharge sidewall}, a lower discharge surface and an upper discharge surface which collectively define a discharge opening 
The grain column includes { TAIL ~ a left lateral discharge sidewall } , { HEAD ~ a right lateral discharge sidewall } , a lower discharge surface and an upper discharge surface which collectively define a discharge opening
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH