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