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