GLS periodograms for GJ 338 B activity and RV data. In all panels, the horizontal dashed lines indicate FAP levels of 10% (red), 1% (orange), and 0.1% (green). Panel a: CARMENES RVs from the VIS channel. The three highest peaks at 8.3, 16.6, and 24.4 d are labeled and their positions are marked in all other panels with vertical dashed lines. Panel b: V -band photometry. Panels c–e: chromospheric line indices of the infrared Ca II triplet, Hα, and dLW. Panels f–h: FWHM, contrast, and bisector velocity span from the CCF analysis. Panel i: chromatic RV index (CRX).