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