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. Author manuscript; available in PMC: 2016 Apr 1.
Published in final edited form as: J Struct Biol. 2015 Feb 16;190(1):47–55. doi: 10.1016/j.jsb.2015.02.003

Figure 2.

Figure 2

Coordinate system transformation and polar azimuthal orthographic projection of the center of mass of a protein residue. Every coat protein residue is represented as a point in space (black dots). Cartesian coordinates (x, y, z) are transformed into an spherical system (r, φ, ψ), setting, leaving all residues lying on the surface of a unit sphere. An orthogonal projection (parallel to the Z axis) onto a tangential plane through the north pole is then applied, ending up with a two dimensional φ-ψ polar map representation of the relative position of all coat protein residues.