virtual void writeFields(const amr::AmrScalarFieldContainer_t &rho, const amr::AmrScalarFieldContainer_t &phi, const amr::AmrVectorFieldContainer_t &efield, const amr::AmrIntArray_t &refRatio, const amr::AmrGeomContainer_t &geom, const int &nLevel, const double &time, const double &scale=1.0)=0