Left panel: snapshot of the GCM solution for WASP-121b at 600 days, showing temperature and wind fields at approximately 0.1 bar. Center and right : scalograms of the zonal wind at the equator and midlatitudes revealing a prominent k̂ ≈ 1 mode in both regions. Large-scale (k̂ ≤ 0.5) and small-scale (k̂ ≥ 1.5) contributions are also evident in both, although they are weaker at the equator.