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A Àà´íÎóÖУºCoordinates do not Form a Properly Connected Set  £¬ ÈçºÎ½â¾ö

    Atoms given in a CIF should form a 'connected set', i.e. no symmetry
operations are needed to get atoms in a bonding position. A connected set of
atoms is not needed for the least squares refinement (unless hydrogen atoms
are to be added at calculated positions). Geometry listings (bonds, angles,
torsions & H-bonds) become unwieldy for non-connected atom sets¡£
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