{HEAD ~ The present invention} relates to natural gas and oil well mud logging and coal bore hole logging, and more particularly to {TAIL ~ methods} and apparatus for analyzing the composition of the hydrocarbon gases and vapors entrapped in the drilling mud by measuring the absorption of various laser beams by the hydrocarbon gases and vapors 
relates particularly to
{ HEAD ~ The present invention } relates to natural gas and oil well mud logging and coal bore hole logging , and more particularly to { TAIL ~ methods } and apparatus for analyzing the composition of the hydrocarbon gases and vapors entrapped in the drilling mud by measuring the absorption of various laser beams by the hydrocarbon gases and vapors
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