VDW surface area over which Vs is negative
Average value of positive electrostatic potential at the VDW surface
Average value of negative electrostatic potential at the VDW surface
Variance of all electrostatic potential at the VDW surface
Variance of positive electrostatic potential at the VDW surface
Variance of negative electrostatic potential at the VDW surface
Electrostatic balance parameter at the VDW surface
Maximum electrostatic potential on the solvent accessible surface
Minimum electrostatic potential on the solvent accessible surface
Solvent accessible surface area over which Vs is positive