  We study parameter estimation accuracy of nearly monochromatic sources of
gravitational waves with the future eLISA-like detectors. eLISA will be capable
of observing millions of such signals generated by orbiting pairs of compact
binaries consisting of white dwarf, neutron star or black hole and to resolve
and estimate parameters of several thousands of them providing crucial
information regarding their orbital dynamics, formation rates and evolutionary
paths. Using the Fisher matrix analysis we compare accuracies of the estimated
parameters for different mission designs defined by the GOAT advisory team
established to asses the scientific capabilities and the technological issues
of the eLISA-like missions.
