The cut off portion of light rays forms {HEAD ~ a cut off portion} of {TAIL ~ the light distribution pattern} 
of
The cut off portion of light rays forms { HEAD ~ a cut off portion } of { TAIL ~ the light distribution pattern }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL