Method and {HEAD ~ apparatus} for analyzing {TAIL ~ components} of hydrocarbon gases recovered from oil, natural gas and coal drilling operations 
for analyzing
Method and { HEAD ~ apparatus } for analyzing { TAIL ~ components } of hydrocarbon gases recovered from oil , natural gas and coal drilling operations
OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH