Sterile-neutrino search based on 259 days of KATRIN data - H. Acharya; M. Aker; D. Batzler; A. Beglarian; J. Beisenkötter; M. Biassoni; B. Bieringer; Y. Biondi; M. Böttcher; B. Bornschein; L. Bornschein; M. Carminati; et al. (Nature, 2025)