The walls of {TAIL ~ the light trap structure} 42 have {HEAD ~ reflective and non reflective interior surfaces} which are indicated at 92, 94, respectively 
The walls of { TAIL ~ the light trap structure } 42 have { HEAD ~ reflective and non reflective interior surfaces } which are indicated at 92 , 94 , respectively
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH