
%                {'c'}                  the speed of light in a vacuum
%                {'g'}                  acceleration due to gravity
%                {'e'}                  charge on an electron
%                {'me'}                 mass of an electron
%                {'mp'}                 mass of a proton
%                {'Planck','h'}         energy expended over time
%                {'alpha'}              fine structure constant
%                {'R'}                  gas constant
%