checkCIF procedure

PLAT913

 This ALERT reports the number of missing reflections with Fc**2 values 
 greater than the largest F(calc)**2 value in the FCF. Possible causes: 
 Missing cusp of data (due to rotation about one axis), deleted (overflow)
 reflections or improper strategy (orthorhombic for monoclinic crystal etc.)
 or behind the beamstop. See the '.ckf' file for details.