Nucleation rates of NH₃[s] using MCNT (Eq. (7)). Left: contours of log₁₀ J_* [cm⁻³ s⁻¹] of NH₃[s] (colour bar and thin black lines) across the temperature-pressure grid, and the gas-solid phase equilibrium S (T _gas, p _gas) = 1 zone (thick black, solid). Right: S = 1 phase equilibrium result (black, solid) and selected log₁₀ J_* contour lines (black, dashed) compared the (T _gas, p _gas) profiles of a T _eff = 400 K, log g = 5 (dark orange, solid), Exo-REM (Baudino et al. 2015, 2017), Jupiter (brown, solid; Rimmer & Helling 2016), Saturn (gold, solid), Uranus (cyan, solid) and Neptune (dark blue, solid; Lindal 1992).