This is another solution which enables measuring and detecting {HEAD ~ several different gases} by {TAIL ~ a single measurement} 
by
This is another solution which enables measuring and detecting { HEAD ~ several different gases } by { TAIL ~ a single measurement }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL