Data items in the GEOM and related (GEOM_ANGLE,
               GEOM_BOND, GEOM_CONTACT, GEOM_HBOND and GEOM_TORSION)
               categories record details about the molecular
               geometry as calculated from the contents of the ATOM, CELL
               and SYMMETRY data.

               Geometry data are therefore redundant, in that they can be
               calculated from other more fundamental quantities in the data
               block. However, they provide a check on the correctness of
               both sets of data and enable the most important geometric data
               to be identified for publication by setting the appropriate
               publication flag.