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