At {TAIL ~ a water loading} above about 11%, {HEAD ~ the reactivity and HCl capacity} began to decrease, indicating the critical range over which this surprising advantage results 
At
At { TAIL ~ a water loading } above about 11 % , { HEAD ~ the reactivity and HCl capacity } began to decrease , indicating the critical range over which this surprising advantage results
REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH