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