Initial constraints on the elemental abundances in the atmosphere of WASP-39 b. The O/H (blue), C/H (red), and S/H (yellow) ratios are derived from the molecular abundances retrieved from JWST data in the 3–5 μm range combined with HST/WFC3 data (0.8–1.7 μm). The elemental abundances are shown relative to solar values (Asplund et al. 2021). The dashed vertical line denotes the planet mass (0.28 M _J). Closed and open circles within the gray shaded region refer to retrievals using JWST data from the Tiberius and Eureka pipelines, respectively, offset horizontally for clarity. The C/H abundances for solar system giant planets (Atreya et al. 2022) along with a linear fit (in brown) and the O/H in Jupiter from Juno (Li et al. 2020) are shown for reference.