Methane number density and mixing ratio profiles. The profile from Moses et al. (2018) is shown for reference only. All other profiles are calculated using Eq. (1). The profiles with solid lines for $K_{zz}^{*}$ = 2150, 1130, and 1040 cm²/s represent the solution CH₄ profiles that reproduce 1280 Å brightnesses of 14, 20, and 21 R $({20}_{-6}^{+1}\text{\hspace{0.17em}R})$, respectively, when resonant scattering by H is included in the radiative transfer simulations. The dot-dashed profile, with $K_{zz}^{*}=170{\text{cm}}^2\text{/s}$, provides the observed 1280 Å brightness of 20 R for simulations without including the resonant scattering by H. The starting number density and mixing ratio (at z₀ = 0 km or total atmospheric pressure (P) = 1 bar) in all profiles are 1.41 × 10¹⁵ cm⁻³ and 1.6 × 10⁻⁵, respectively (see Table 1 for additional profile parameters). The altitude versus pressure profile in the model atmosphere is shown in Fig. B1.