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