Fig. 2.
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The a vs. (g1 − y) diagram for the 387 normal type (filled symbols) and 1240 mCP stars (open symbols). The normality line a = −2.16(8)+0.363(8)(g1 − y) is defined as in the classical Δa photometric system. The dotted lines are the 95% prediction bands to select mCP stars. We also indicated the approximate spectral types according to the CMD (Fig. 1).
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