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