Fig. 15.
Same as Fig. 12, with all Ap stars in the top and the remaining Ap stars after our astrometric selection in the bottom panel, where the BP − RP colour has been replaced by the Teff that is also provided in Gaia DR2 (Andrae et al. 2018). Except for HD 137909 (see text), the marked objects are the same as labelled in Fig. 12 as outliers.
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