Fig. 4
Colorequations of hot white dwarfs from the Landolt photometric standards (Landolt 1992) and from the spectrophotometric standards (Landolt & Uomoto 2007) versus Gaia DR2. The target position used for calibrations is given in the lower panel. While all other stars are hot nearby compact white dwarfs without PNe, the encircled target is the central star of the Helix nebula.
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