Fig. 2
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Hertzsprung–Russell diagram of CSPNe in the LMC and SMC. The coldest CSPN in the SMC likely has poorly constrained parameters, as an effective temperature (Teff) above 10 000 K is required to efficiently ionise hydrogen. The orange contour shows the distribution of points for the MW. In grey, two regions with extreme values are highlighted (see text for details).
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