JWST observations of WASP-107 b (colored vertical bars) along with the best-fit model (black line; K_zz = 10⁹ cm² s⁻¹), resulting in a ${\stackrel{\sim }{\chi }}_{\mathrm{red}}^2=3.4$. The NIRISS observations are shifted vertically by 130 ppm to match the NIRCam data at the wavelengths where they overlap. The runs with higher and lower K_zz are shown with blue and brown lines, respectively, to illustrate the spectroscopic effects of varying the turbulent diffusivity. The simulated spectrum of a cloudless atmosphere is plotted in gray.