Fig. A.1.
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mF322W2 vs. mF606W − mF322W2 CMDs zoomed in around the SGB. The left panels show the observed CMDs of Boötes I, where the red and blue lines are isochrones with different [Fe/H], [α/Fe], and ages, as indicated in the insets. The middle panels show simulated CMDs composed of coeval stellar populations (top) and of stellar populations with different ages (bottom). The right panels are the same as the middle panels, but include approximately the same number of stars as in the observed CMDs.
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