checkCIF procedure

PLAT021

 The number of unique relections is the value reported in the CIF with the
 dataname '_reflns_number_total'. The expected number of reflections 
 corresponds to that in the asymmetric unit of the Laue group. Expected ratio:
 less-or-equal 1 for centro symmetric structures and less than 2 for
 non-centrosymmetric structures. 
 Reasons to exceed those numbers can be:
  1 - Systematic absencies not omitted from the observed data count.
  2 - Refinement with redundant (i.e. not merged/unique) data set.  
  3 - SHELXL HKLF 5 Refinement