The features, for example, include colors, {HEAD ~ grey scale levels}, cell shape, patterns within a cell or any grouping discernable by {TAIL ~ an area array camera} or similar device 
The features , for example , include colors , { HEAD ~ grey scale levels } , cell shape , patterns within a cell or any grouping discernable by { TAIL ~ an area array camera } or similar device
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH