An illumination source is provided for illuminating {HEAD ~ four spaced apart inspection regions} which are disposed about {TAIL ~ an inspection window} 
An illumination source is provided for illuminating { HEAD ~ four spaced apart inspection regions } which are disposed about { TAIL ~ an inspection window }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL