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. Author manuscript; available in PMC: 2011 Dec 3.
Published in final edited form as: IEEE/ACM Trans Comput Biol Bioinform. 2011 Nov-Dec;8(6):1458–1467. doi: 10.1109/TCBB.2011.81

Fig. 1.

Fig. 1

Three molecular surfaces are shown for two atoms in two dimension. The boundary of the union of balls (dotted red line) with the van der Waals radii is the VWS. The SAS (solid thin line in purple) is the union of augmented van der Waals spheres with each radius enlarged by the radius of a solvent probe (light blue sphere). The SES (the solid thick line in blue) is boundary of all possible solvent probes that do not intersect with the interior of the VWS.