Completeness (as a percentage) of symmetry-unique data
               within the intersection of (1) a sphere (defined by the
               diffraction limits, _reflns.d_resolution_high and
               _reflns.d_resolution_low) and (2) the ellipsoid
               (described by __reflns.pdbx_aniso_diffraction_limit_*
               items), relative to all possible symmetry-unique
               reflections within that intersection.