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Abstract

Over the last few years, there has been a large momentum to ensure that the
third-generation era of gravitational wave detectors will find its realisation
in the next decades, and numerous design studies have been ongoing for some
time. Some of the main factors determining the cost of the Einstein Telescope
lie in the length of the interferometer arms and its shape: L-shaped detectors
versus a single triangular configuration. Both designs are further expected to
include a xylophone configuration for improvement on both ends of the frequency
bandwidth of the detector. We consider binary neutron star sources in our
study, as examples of sources already observed with the current generation
detectors and ones which hold most promise given the broader frequency band and
higher sensitivity of the third-generation detectors. We estimate parameters of
the sources, with different kinds of configurations of the Einstein Telescope
detector, varying arm-lengths as well as shapes and alignments. Overall, we
find little improvement with respect to changing the shape, or alignment.
However, there are noticeable differences in the estimates of some parameters,
including tidal deformability, when varying the arm-length of the detectors. In
addition, we also study the effect of changing the laser power, and the lower
limit of the frequency band in which we perform the analysis.