Extended Data Fig. 7: Redshift and sky area distributions for identifiable quadruple-image events in 30 years.
From: An interference-based method for the detection of strongly lensed gravitational waves

The vertical dashed black curve indicates the redshift threshold at zs = 2.1, where the host galaxy is more than 60% likely to have a magnitude less than 26. The horizontal black dashed line represents the maximum sky localization area of 5 square degrees.