The value of {HEAD ~ the elements} in {TAIL ~ the resulting data array} indicate the brightness of their corresponding pixels in the image array 51 
in
The value of { HEAD ~ the elements } in { TAIL ~ the resulting data array } indicate the brightness of their corresponding pixels in the image array 51
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH