The amount of {TAIL ~ ester} used will be in the range of from about 0.3% to {HEAD ~ about 3%} 
The amount of { TAIL ~ ester } used will be in the range of from about 0.3 % to { HEAD ~ about 3 % }
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD