NonBonded EAM schema
====================
A full description of the overall NonBonded EAM model.

Required Keys
-------------

The following properties are required for the NonBonded EAM specification.
   +-------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------+
   | Key Name                                                                                        | Description                                                                                                              | Field Type                                                                       |
   +=================================================================================================+==========================================================================================================================+==================================================================================+
   | density                                                                                         | Array of (discretized) atomic electron densities.                                                                        | array[number]                                                                    |
   +-------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------+
   | embed                                                                                           | Array of embedding (discretized) energy terms. Default unit is kJ/mol.                                                   | array[number]                                                                    |
   +-------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------+
   | potential                                                                                       | Array of (discretized) pair potential interaction functions. Default unit is kJ/mol.                                     | array[number]                                                                    |
   +-------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------+

Optional Keys
-------------

The following keys are optional for the NonBonded EAM specification.
   +-------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------+
   | Key Name                                                                                        | Description                                                                                                              | Field Type                                                                       |
   +=================================================================================================+==========================================================================================================================+==================================================================================+
   | embed_units                                                                                     | Units for the embedding energy term.                                                                                     | string                                                                           |
   +-------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------+
   | pair_units                                                                                      | Units for the pair potential interaction term.                                                                           | string                                                                           |
   +-------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------+