Hans-Walter Rix and I discussed with Rene Andrae (MPIA) and Morgan Fouesneau (MPIA) how they are fitting the (not yet public) BP-RP spectra from the ESA Gaia mission. The rules are that they can only use certain kinds of models and they can only use Gaia data, nothing external to Gaia. It's a real challenge! We discussed methods and ideas for verifying and testing results.
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