In {TAIL ~ some embodiments}, {HEAD ~ another light source} 314 and associated optics may be provided by an analyzer 
In
In { TAIL ~ some embodiments } , { HEAD ~ another light source } 314 and associated optics may be provided by an analyzer
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH