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Fig. 7.

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Spectral energy distribution of a typical red GC ([M/H] ≃ −0.2) and blue GC ([M/H] ≃ −2), as predicted at ages of 8 Gyr (dashed) or 13 Gyr (solid) with two population synthesis models. In red, the detection limits of the four Euclid passbands IE, YE, JE, and HE are shown, together with the 10 yr LSST survey limits for the ugriz bands.

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