Enlargement of the GLS periodogram of the CARMENES VIS RV data of GJ 338 B (blue line) around the three strongest signals (marked with color-coded dots). The window function is plotted as the orange line. Horizontal dashed lines indicate the different FAPs: 0.1% (green), 1% (orange) and 10% (red). The 1-sidereal-year aliases around each of the strongest signals are indicated with vertical solid lines.