Each ELEC statement must start with the type of calculation to be performed. The type is specified with the following syntax

   ELEC [ [#ELEC block naming|name {id}] ]
       {type}
       {keywords...}

where {type} is one of the following keywords denoting different types of electrostatics calculations

mg-auto

Automatically-configured sequential focusing multigrid Poisson-Boltzmann calculations.

mg-para

Automatically-configured parallel focusing multigrid Poisson-Boltzmann calculations.

mg-manual

Manually-configured multigrid Poisson-Boltzmann calculations.

fe-manual

Manually-configured adaptive finite element Poisson-Boltzmann calculations.

mg-dummy

Calculations of surface and charge distribution properties which do not require solution of the PBE.

and {keywords...} are the calculation-specific keywords. As a general rule, all keywords in an APBS input file are required. This rule is broken in a few places with very rare keywords but should be observed for most typical calculations.

Each of these types of calculations, and their accompanying keywords, is described in more detail below.