Spectra and Supplemental Fit Material For "JWST/NIRSpec Spectra for Three Ultracool Brown Dwarfs Detected in Extragalactic Surveys: Further Evidence for Phosphine Absorption"

Supplemental material to accompany the paper "JWST/NIRSpec Spectra for Three Ultracool Brown Dwarfs Detected in Extragalactic Surveys: Further Evidence for Phosphine Absorption" by Hainline et al. (submitted). This material includes: Observed JWST/NIRSpec prism spectra for JADES-GS-BD-5, JADES-GS-BD-11, and MoM-239450 (three columns: wavelength in microns, flux in nanoJy, and flux error in nanoJy). Corner plots, SED plots, and output parameters from fits to JADES-GS-BD-5, JADES-GS-BD-11, and MoM-239450 with NIFTY (https://github.com/kevinhainline/NIFTY, Hainline et al. 2026, doi.org/10.48550/arXiv.2510.00111) Corner plots and a Temperature/Pressure diagram for fits to JADES-GS-BD-11 with petitRADTRANS4 (P. Molliere et al. 2019, Nasedkin et al. 2024, Nasedkin et al. in prep)