The actual etch rate of {TAIL ~ the first bath} was 0.15 mils/min before and 0.65 mils/min after {HEAD ~ the addition} of additive  
The actual etch rate of { TAIL ~ the first bath } was 0.15 mils / min before and 0.65 mils / min after { HEAD ~ the addition } of additive
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH