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This paper describes the contents of the Euclid First Data Release (DR1), together with the set of papers that document the data-processing and the data products. DR1 consists of two parts: first `DR1-Foundation', releasing images, spectra, and catalogues in November 2026. Second, the shear measurements and the `Level~3' products required for cosmological analyses will be added in June 2027 to complete the full DR1. This data set contains around a billion catalogued objects, mainly from the Euclid Wide Survey (1975\,deg²) and the Euclid Deep Fields (77\,deg²)
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Collaboration et al. (2026) studied this question.
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