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This tool calculates the groups and integrations for an optimal transit observation. We require some information about your background star, transit, and planned use of JWST (instrument, subarray, and filter), in order to interpolate your planned transit observation to our nearest information from pandeia (which powers the JWST ETC.)
Please know that at present this tool is likely to overestimate saturation on direct comparison to the ETC. (This means we may predict less groups -- and put you in LESS danger of oversaturating your observation.)