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