The second parameter is the difference in {HEAD ~ “chroma}” which is {TAIL ~ the difference} in “strong versus weak color.” 
is
The second parameter is the difference in { HEAD ~ “ chroma } ” which is { TAIL ~ the difference } in “ strong versus weak color . ”
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH