The illuminating light is further collected and directed toward the document by a pair of reflective side surfaces which define {HEAD ~ walls} for {TAIL ~ the illumination station} 
for
The illuminating light is further collected and directed toward the document by a pair of reflective side surfaces which define { HEAD ~ walls } for { TAIL ~ the illumination station }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL