Although as depicted, {HEAD ~ the interior sidewalls} of {TAIL ~ cavity body} 105 are rectangular in shape as viewed from the top of illumination module 100, other shapes may be contemplated  
of
Although as depicted , { HEAD ~ the interior sidewalls } of { TAIL ~ cavity body } 105 are rectangular in shape as viewed from the top of illumination module 100 , other shapes may be contemplated
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH