Colour–magnitude diagram (panel a) and Hertzsprung–Russell diagram (panel b) highlighting stars of known classes (from the literature): Cepheids (Tammann et al. 2003), RR Lyrae (Wils et al. 2006), red clump (Bovy et al. 2014), white dwarfs (Kleinman et al. 2013), γ Doradus and δ Scuti (Sarro et al. 2016), Solar analogues (Tucci Maia et al. 2016), OB (Ramírez-Agudelo et al. 2017; Simón-Díaz et al. 2011, 2017), and BHB (Sirko et al. 2004). We show only stars with clean flags and parallax uncertainties better than 50%. A 20% limit would remove all BHB stars.