Supplementary Information: Magnesium Silicate Clouds in the Atmosphere of HD 209458b from a Rule-Based Tree-Structured Data Reduction. Chubb & Grant et al. (2026)

Supplementary information for the publication "Magnesium Silicate Clouds in the Atmosphere of HD 209458b from a Rule-Based Tree-Structured Data Reduction", Chubb & Grant et al. (2026). Summaries of all the "ReadMe" and corresponding files are given below. > ReadMe_hd209_ExoTiC_tree_four_leaf_spectra.txt: hd209_ExoTiC_tree_four_leaf_spectra.txtData for Figure 4 of "Magnesium Silicate Clouds in the Atmosphere of HD 209458b from a Rule-Based Tree-Structured Data Reduction", Chubb & Grant et al. 2026See ReadMe file for column contents and units > ReadMe_transmission_spectrum_and_light_curves_ExoTiC_vtree2_bin0.25_utc20240111_083853_nc.txt: transmission_spectrum_and_light_curves_ExoTiC_vtree2_bin0.25_utc20240111_083853.ncData for data reduction described in "Magnesium Silicate Clouds in the Atmosphere of HD 209458b from a Rule-Based Tree-Structured Data Reduction", Chubb & Grant et al. 2026NetCDF Data File containing spectroscopic transit light curve products and fitted transmission spectrum results generated using the ExoTiC-MIRI reduction and fitting pipeline for JWST/MIRI LRS observations of HD209458b. See ReadMe file for example of how to read the file format. > ReadMe_hd209_paper_figure1_wlc_hv1rasterized.txt: hd209_paper_figure1_wlc_hv1.pdfhd209_paper_figure1_wlc_hv1rasterized.pdfImage files for Figure 1 of "Magnesium Silicate Clouds in the Atmosphere of HD 209458b from a Rule-Based Tree-Structured Data Reduction", Chubb & Grant et al. 2026, in rasterized and non-rasterized formats > Readme_picaso_Virga_files.txt: mg2sio4_full_median_and_max_logl_picaso_virga.nc - for the Mg2SiO4 atmospheremgxsioy_full_median_and_max_logl_picaso_virga.nc - for the combined Mg2SiO4/MgSiO3 atmosphere Files for the picaso/Virga grid-retrievals from "Magnesium Silicate Clouds in the Atmosphere of HD 209458b from a Rule-Based Tree-Structured Data Reduction", Chubb & Grant et al. 2026. See ReadMe for details on the file format and an example of how to extract the data. Models were run using the PICASO 3.0 climate code and Virga 1.0 cloud code and include the full chemistry, temperature-pressure profiles, and cloud opacities for each cloud run. > ReadMe_ARCiS_files.txt: Files for the ARCiS free and equilibrium chemistry retrievals from "Magnesium Silicate Clouds in the Atmosphere of HD 209458b from a Rule-Based Tree-Structured Data Reduction", Chubb & Grant et al. 2026 The list of files included in each zipped folder are listed below, with file descriptions given in the ReadMe file. ARCiS_clear_full_dataset:obs001_ARCiS_clear_full_datasetobs002_ARCiS_clear_full_datasetobs003_ARCiS_clear_full_datasetpost_equal_weights_ARCiS_clear_full_dataset.datPT_limits_ARCiS_clear_full_datasettrans_limits_ARCiS_clear_full_dataset ARCiS_clear_LRS:post_equal_weights_ARCiS_clear_LRS.datPT_limits_ARCiS_clear_LRStrans_limits_ARCiS_clear_LRS ARCiS_combo_full_dataset:obs001_ARCiS_combo_full_datasetobs002_ARCiS_combo_full_datasetobs003_ARCiS_combo_full_datasetpost_equal_weights_ARCiS_combo_full_dataset.datPT_limits_ARCiS_combo_full_datasettrans_limits_ARCiS_combo_full_dataset ARCiS_combo_LRS:post_equal_weights_ARCiS_combo_LRS.datPT_limits_ARCiS_combo_LRStrans_limits_ARCiS_combo_LRS ARCiS_Mg2SiO4_full_dataset:obs001_ARCiS_Mg2SiO4_full_datasetobs002_ARCiS_Mg2SiO4_full_datasetobs003_ARCiS_Mg2SiO4_full_datasetpost_equal_weights_ARCiS_Mg2SiO4_full_dataset.datPT_limits_ARCiS_Mg2SiO4_full_datasettrans_limits_ARCiS_Mg2SiO4_full_dataset ARCiS_Mg2SiO4_LRS:post_equal_weights_ARCiS_Mg2SiO4_LRS.datPT_limits_ARCiS_Mg2SiO4_LRStrans_limits_ARCiS_Mg2SiO4_LRS ARCiS_Mg2SiO4_eq_chem_full_dataset:obs001_ARCiS_Mg2SiO4_eq_chem_full_datasetobs002_ARCiS_Mg2SiO4_eq_chem_full_datasetobs003_ARCiS_Mg2SiO4_eq_chem_full_datasetpost_equal_weights_ARCiS_Mg2SiO4_eq_chem_full_dataset.datPT_limits_ARCiS_Mg2SiO4_eq_chem_full_datasettrans_limits_ARCiS_Mg2SiO4_eq_chem_full_dataset