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