calcining {HEAD ~ said crystalline composition} at a temperature of from {TAIL ~ about 200° C.} to about 600° C., 
calcining { HEAD ~ said crystalline composition } at a temperature of from { TAIL ~ about 200 ° C. } to about 600 ° C. ,
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH