checkCIF procedure

PLAT193

 The reported '_cell_measurement_temperature' deviates from the reported  
 '_diffrn_ambient_temperature value'. The relevant set of cell parameter
 values are those at the datacollection temperature (i.e. ambient temperature
 at the crystal) because the derived geometry parameter values will be correct
 and meaningful only when those cell parameter values are used. When relevant,
 cell parameter values at temperatures differing from the
 '_diffrn_ambient_temperature' are best archived as comment value under 
 _cell_special_details.