{TAIL ~ The highest accuracy} in time is acquired for {HEAD ~ pinpoint light sources}, whose transmission duration is of the same order of size as that of the line transfers 
{ TAIL ~ The highest accuracy } in time is acquired for { HEAD ~ pinpoint light sources } , whose transmission duration is of the same order of size as that of the line transfers
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH