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