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Fig. 3.

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Correlations between the parameters extracted from mock SDSS photometric observations for galaxies at 40 Mpc and the ex situ stellar mass fraction of galaxies. The grey dots are TNG100 galaxies; the black solid and dashed curves are the running median and the ±1σ scatter of the TNG100 galaxies. The blue symbols are for EAGLE galaxies. The Spearman’s rank coefficient(ρ) of each correlation is labelled in the figure.

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