Method and system for detecting one or more gases or gas mixtures and for measuring the concentration of {HEAD ~ one or more gases} or {TAIL ~ gas mixtures} 
Method and system for detecting one or more gases or gas mixtures and for measuring the concentration of { HEAD ~ one or more gases } or { TAIL ~ gas mixtures }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL