The document 10 is moved in direction 14 so that all portions of the document are eventually illuminated by the line of light, or {HEAD ~ scan line} 16, which is produced by {TAIL ~ the illuminating devices} of the scanner 
is produced by
The document 10 is moved in direction 14 so that all portions of the document are eventually illuminated by the line of light , or { HEAD ~ scan line } 16 , which is produced by { TAIL ~ the illuminating devices } of the scanner
OTH OTH OTH OTH OTH 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 HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH