sentence1: in this paper we investigate the effect of spin-orbit and spin-spin couplings both on the estimation of astrophysical parameters within general relativity , and on bounds that can be placed on alternative theories .
sentence2: conclusions in this paper we analysed how the inclusion of spin couplings affects parameter estimation in observations of binary coalescence , and the bounds that can be placed on alternative theories of gravity , such as the brans-dicke and massive graviton theories .