{TAIL ~ This construction} also allows the use of filters to remove particulates before {HEAD ~ the sample} reaches the chromatographic medium 
{ TAIL ~ This construction } also allows the use of filters to remove particulates before { HEAD ~ the sample } reaches the chromatographic medium
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH