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\subsection{Post-Newtonian Approximation of Warping by  Electromagnetic Warping} Source}  Because the Einstein Field Equations are computationally difficult and a tabletop experiment involves measurement of weak fields, Post-Newtonian approximations are helpful to understanding the scale of measurements of laboratory EM fields. Applicable approximations will also describe the nature of the EM field and give and indicate the geometry of gravitational warping. We found it necessary to focus on Post-Newtonian approximations that directly correlated an EM field to gravitational effects.  [theory about neutron stars, etc]