For example, the infrared light source 92 may be physically separated from the light source 74 by superimposing {HEAD ~ the locator beam} 90 onto {TAIL ~ the light} from the light source 74 with a beam splitter and steering optics 
onto
For example , the infrared light source 92 may be physically separated from the light source 74 by superimposing { HEAD ~ the locator beam } 90 onto { TAIL ~ the light } from the light source 74 with a beam splitter and steering optics
OTH 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 OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH