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