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Electrostatic potential (ϕ) surface maps generated with the nonlinear Poisson-Boltzmann equation (PBE) for a 40 base pair ideal A-RNA helix embedded in a NaCl solution. Using the notation in Figure 2, the ϕ scale in kT/e is (G,B,W,R,Y) = (+5,+2.5,0,−2.5, −5). The gray meshes represent isocontours where the difference between the concentration of counterions given by the size-modified PBE and that given by the nonlinear PBE is (a) 0.1 M and (b) 1.0 M NaCl.
