checkCIF procedure

PLAT962

 Reflections with Sig(I) = 0.0 are suspect and best left out of the  
 refinement. This type of reflections will result in multiple R & S-value
 difference ALERTS. Note: Sometimes such a 0.00 value may be related to the
 limited number of reported decimals in the FCF file as opposed to those in 
 the unscaled unmerged HKL file.