Assuming {HEAD ~ power costs} are at {TAIL ~ $50.00/MW}, then the fourth linguistic values are  
are at
Assuming { HEAD ~ power costs } are at { TAIL ~ $ 50.00 / MW } , then the fourth linguistic values are
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH