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Measuring two or more tones in one event tests this directly.","posed_since":"2004","precise":"For merger remnants, measure the complex frequencies of at least two independent quasinormal modes, for example $(l,m,n) = (2,2,0)$ together with $(2,2,1)$, $(3,3,0)$ or $(4,4,0)$, and constrain the fractional deviations $\\delta f$ and $\\delta \\tau$ from Kerr values for a common mass and spin. The target is $\\mid\\delta f\\mid, \\mid\\delta \\tau\\mid$ below 0.01. An answer is the measured deviations with uncertainties from a catalog of events.","problem_ref":"140b021e704aeaafa181884dad7d2bffc67d70cc4cc34bf112245d74ea7a16fd","references":"","settled_by":"Multi-mode ringdown measurements with percent-level frequency and damping-time constraints from next-generation ground detectors or LISA.","status_note":"GW250114 gave two modes at $4.1\\,\\sigma$ with the overtone frequency consistent with Kerr to plus or minus $30\\%$ and the damping rate unconstrained (LIGO-Virgo-KAGRA 2025).","title":"Do remnant black hole ringdown tones match Kerr at percent 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