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