To accomplish this, {HEAD ~ the green monochromatic channel} can be selected as {TAIL ~ a reference channel} 
selected as
To accomplish this , { HEAD ~ the green monochromatic channel } can be selected as { TAIL ~ a reference channel }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL