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This......
. The coming years can be expected to bring additional multi-messenger binary neutron star events, as well as numerous detections of binary black hole mergers25, for which electromagnetic counterparts are not expected. Combining subsequent independent measurements of H0 from these future standard sirens will only improve the estimate made from GW170817, leading to an era of percent-level gravitational-wave cosmology.
Sounds like an add.......
alex
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