Comparison of emission spectra for models using NIST-JANAF versus Burcat (NASA9) thermodynamic data. The upper panel shows the PH₃/HCN model for f = 2/3 from Figure 3, along with volume mixing ratios of key species. Solid lines represent abundances for the NIST-JANAF models, while dashed lines correspond to the Burcat models. The lower panel shows the PO/CO₂ models for f = 1/4 model from Figure 1. Also show is the Eureka! reduction of the NIRCam and MIRI data from Hu et al. (2024).