a density ratio setting module that sets {HEAD ~ the ratio} of {TAIL ~ the density} of the first chromatic color dots to the density of the second chromatic color dots, 
of
a density ratio setting module that sets { HEAD ~ the ratio } of { TAIL ~ the density } of the first chromatic color dots to the density of the second chromatic color dots ,
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH