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