The reference data is hexadecimal data F0 representing the density of a black dot, while hexadecimal data FF represents {TAIL ~ the density} of {HEAD ~ a white dot} 
The reference data is hexadecimal data F0 representing the density of a black dot , while hexadecimal data FF represents { TAIL ~ the density } of { HEAD ~ a white dot }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD