Extended Data Figure 7: Signal searches on the spectroscopic Hα index.
From: A terrestrial planet candidate in a temperate orbit around Proxima Centauri
a–c, Likelihood-ratio periodogram searches of Hα intensity from the UVES (a), HARPS pre-2016 (b) and HARPS PRD (c) campaigns. No signals were detected above the 1% threshold. The green vertical lines mark the period of the planet candidate at 11.2 d.
