NIRISS/SOSS (left) and NIRSpec/PRISM (right) spectral features’ deviations from bulk variability for SIMP J0136. Top row: presumed iron (lower layer, 1.0–1.4 μm) and forsterite (upper layer, 1.4 –1.8 μm) cloud modulation. Wavelengths are based on models and previous observations of cloud-influenced pressure levels and wavelengths for SIMP J0136 (see, e.g., J. M. Vos et al. 2023; A. M. McCarthy et al. 2025). Second row: H₂O deviation map, anticorrelated with forsterite cloud modulation. Third row: CO deviation map, anticorrelated with forsterite cloud modulation. Fourth row: low-altitude CH₄ deviation map, correlated with forsterite cloud modulation. Fifth row: (NIRSpec/PRISM only) high-altitude CH₄ deviation map. The deviations possess similar harmonic periodicity of a low-altitude CH₄ feature above the cloud tops but with a reverse sign, tentatively indicating emission at higher altitudes. Bottom row: (NIRSpec/PRISM only) high-altitude continuum deviation, correlated with forsterite cloud modulation.