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