read 
    mol pqr dna.pqr         # Read in DNA
end
elec
    mg-auto
    dime 97 97 161          # Rectangular grid dimensions
    fglen 130 130 200        # Rectangular box
    fgcent mol 1             # Center on the molecule
    cglen 160 160 230        # Rectangular box
    cgcent mol 1             # Center on the molecule
    mol 1                   
    npbe                    # Nonlinear DNA
    bcfl mdh                # Full multipole approximation
    ion 1 0.100 2.0         # 100 mM Na+
    ion -1 0.100 2.0        # 100 mM Cl-
    pdie 1.0                # Solute dielectric
    sdie 78.54              # Solvent dielectric
    chgm spl0               # Linear charge discretization
    srfm smol               # Smoothed molecular surface
    srad 1.4                # Solvent probe radius
    swin 0.3                # Spline surface window (not used)
    sdens 10.0              # Sphere density
    temp 298.15             # Temperature
    gamma 0.105             # Apolar coefficient
    calcenergy no           # No energies
    calcforce no            # No forces
    write qdens dx qdens    # Write out charge density
    write pot dx pot        # Write out potential
end

quit
