Radius-ratio interpolation schemes supported by ExoIris. The black dots show the posterior median radius-ratio knots with their 68% central posterior intervals, as inferred from the JWST WASP-39 b NIRISS observations presented in A. D. Feinstein et al. (2023) using five of the supported interpolation schemes (shifted in y for visualization). The black lines show the posterior median transmission spectra, and the colored shading shows their 68% central posterior intervals.