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Fig. 9

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Multiplicative and additive biases averaged over the magnitude selection 20 < IE < 24.5 and PSF variation across the field of view for the measurement and selection. The triangle and the circle denote each of the two components. The light shaded area is the Euclid requirement on knowledge of m and c, respectively σm < 2 × 10−3 and σc < 3 × 10−4. The dark shaded area is the ideal target for measurement alone, respectively σm < 5 × 10−4 and σc < 5 × 10−5. Reference values can be found in Table 2.

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