Extended Data Fig. 7: Analysis of excess flux relative to the nominal 5-group spectrum.
From: A benchmark JWST near-infrared spectrum for the exoplanet WASP-39 b
The 5-group spectrum uses a varying number of groups within the saturated region, as is done in the standard PRISM extraction. (a) Extracted spectra using different numbers of groups relative to the 5-group spectrum. Data are not shown in regions that are already saturated, or where the 5-group spectrum uses the same number of groups. (b) Zoomed-in view of the Top Left panel, specifically the region in panel a that is enclosed in a box, excluding the noisy 1-group spectrum. A Gaussian is fit to the excess flux spectrum. (c) The dilution corrections derived from the median excess flux fit. In all panels the vertical-gray shaded regions denote the level of saturation, with the darkest corresponding to saturation after 1 group and the lightest corresponding to saturation after 4 groups.
