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Specification of binding sites. Exemplary specification of a binding site with the angles, φ and θ, and the length of the bond, r. These variables correspond to spheric coordinates. Coarsely comparable to geographic coordinates, (90° − φ) would correspond to the latitude, θ to the longitude and r would be the distance between the location and the Earth's center. While φ gives the angle between the binding site and the vertical zenith axis, θ gives the rotation around this zenith axis.
