In this configuration the sample fluid enters through the top port 9 of the column 7 and flows through the layers 4, 5 and 6 to bind out and select {HEAD ~ cells} of {TAIL ~ interest} and ultimately drains out the base port 10 
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In this configuration the sample fluid enters through the top port 9 of the column 7 and flows through the layers 4 , 5 and 6 to bind out and select { HEAD ~ cells } of { TAIL ~ interest } and ultimately drains out the base port 10
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 REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH