Fig. 3
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Summary of the key steps in preparing the photometric catalog. First, source lists are generated using the “hot and cold” detection technique and used to perform aperture photometry on PSF-homogenized space-based images. Next, sources are grouped and a joint two-dimensional model light profile is extracted for all sources. Using the morphological parameters extracted from these fits, forced photometry is then performed on all bands. Finally, in the post-processing step, the photometric errors for each source are adjusted based on variance measurements in empty apertures and the source lists are cleaned and flagged. The resulting data products include morphological measurements, model-based photometry in 37 bands, and simple aperture photometry in 6 space-based bands, for more than 700 000 galaxies.
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