Then, the terms gd can be approximately given by an ideal or distorted structure/polyhedron composed of N vertexes. Q0, Qk, and Pk correspond to the center of mass, distorted, and perfect vector coordinates, respectively. The gd function is obtained by the minimization between the difference of distorted coordination and perfect coordination vectors relative to the center of mass vectors of a molecular fragment. In this sense, the distortion of the coordination sphere is analyzed from a general point of view without dependence on the bond length but rather from the deviation from ideal geometries. On the basis of such definitions, the boundaries for any symmetry measure are 100 ≥ gd ≥ 0, where lower limits stand for structures that match the target symmetry, and higher values stand for distorted structures .