checkCIF procedure

PLAT910

 Possible causes: Experimental beamstop Theta(min) limit set too high; A large
 unit-cell causing reflections effected by the beamstop. A possible technical
 solution on CCD based equipment involves the collection of additional images
 with the detector at a larger distance from the crystal with the beamstop 
 setting changed accordingly. Alternatively, a large number of low-order
 'outlier' reflections might have been 'Omitted' deliberately from the (final)
 least-squares refinement. The test is against the actual Theta(Min) of the
 reflections in the '.fcf' file. See the '.ckf' file for details of the missing
 reflections. Good quality low order reflections might be relevant for SQUEEZE
 and similar solvent modelling refinement techniques.