Estimation of quenching levels using the chemical kinetic modeling (Sect. 3.2). Top panels: transection maps of the geometric gCV of H₂O, CH₄, and all species abundances at the equator (latitude = 0°). We choose gCV = 0.05 to separate the chemical equilibrium and disequilibrium regions (dashed white lines). This boundary agrees well with the zeroth-order approximation results (red solid lines in the right panels; Fig. A.7). Middle panels: similar to the top panels, but at the noon-midnight plane (longitude = 0° or 180°). Bottom panels: similar to the top panels, but at the terminator (longitude = 90° and 270°). map suggests a morning-evening asymmetry where the dawn-side abundances have been driven more significantly out of thermochemical equilibrium and at deeper pressure levels.