checkCIF procedure

PLAT165

 Report on restrained (riding) Non-Hydrogen atoms. Note: This may lead to   
 non meaningful bond and angle s.u.'s (ALERTS _751, _752). 
 R-flagged atoms may arise unintentional being caused by an "AFIX 0" line   
 being missing in a shelxl.ins file (SHELXL-97 refinement). 
 Alternatively, the number of refined parameters may have been limited  
 deliberately (e.g. by refinement of C-F with fixed known geometry, 
 similar to C-H) in order to keep the data/parameter ratio acceptable.