{HEAD ~ A field} of view of the image detecting module covers {TAIL ~ the third light guide component} and the fourth light guide component 
covers
{ HEAD ~ A field } of view of the image detecting module covers { TAIL ~ the third light guide component } and the fourth light guide component
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH