The OES analyzes {HEAD ~ light} captured from {TAIL ~ a spark emission stand} through which the fluid sample is flowed 
The OES analyzes { HEAD ~ light } captured from { TAIL ~ a spark emission stand } through which the fluid sample is flowed
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH