{TAIL ~ The method} 1 wherein the heating in step is from {HEAD ~ about 1100° C.} to about 1360° C 
{ TAIL ~ The method } 1 wherein the heating in step is from { HEAD ~ about 1100 ° C. } to about 1360 ° C
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH