A separation tray, suitable for mounting in {HEAD ~ a vertical column}, for separating {TAIL ~ liquid/gas mixtures} 
A separation tray , suitable for mounting in { HEAD ~ a vertical column } , for separating { TAIL ~ liquid / gas mixtures }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL