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