φ21 vs. PSOS distribution of the 3194 Cepheids and RR Lyrae stars published in Gaia DR1. Solid and dashed lines show the loci that were set in the SOS Cep&RRL pipeline to separate RR Lyrae stars from Cepheids and RRc from RRab pulsators. The upper panel shows all 3194 sources; symbols and colour-coding are as in Fig. 17. In the lower panel new discoveries by Gaia are plotted in colour, known variables in grey.
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