Fig. 7
Brightness distributions of the Gaia DR2 candidates (blue) by Holl et al. (2018) in the K2 fields vs. all known confirmed RR Lyrae stars within in the same fields, including stars not in the DR2 variability catalogue. The upper panel shows all fields; the spike at 18 mag is the Sgr stream. The lower panel shows the halo fields only.
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