Comparison of the G395H NIRSpec JWST spectra of COCONUTS-2 b and 0825+2805 from the JWST GO 2124 program. In this figure, each of the three panels is normalized separately to facilitate the comparison to molecule abundances. Assuming that both objects have similar temperature–pressure profiles, we found that the abundances of H₂O and CH₄ in the atmosphere of COCONUTS-2 b are lower than for 0825+2805, which agrees with 0825+2805 being less massive and colder. We also found that the abundances of CO and CO₂ are consistent, which is consistent with COCONUTS-2 b have lower metallicity and it might indicate that the vertical mixing of 0825+2805 is stronger to compensate the effects of mass and temperature.