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