{\Sigma _{\alpha}}_{\bot}^{\rm matt}\wedge{\cal \L\/}_u\underline{\vartheta}^\alpha -\underline{\Sigma}^{\rm matt}_\alpha\,{\cal \L\/}_u u^\alpha +R_{\bot}^{\alpha\beta}\wedge{\tau _{\alpha\beta}}_{\bot}\nonumber\\ &&\hskip0.0cm +E\wedge j +E\wedge{\it l}_u P +B\wedge{\it l}_u M