{HEAD ~ The sight lines} thus correspond to {TAIL ~ the wide static field} of view that is provided to the user 
correspond to
{ HEAD ~ The sight lines } thus correspond to { TAIL ~ the wide static field } of view that is provided to the user
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH