Fig. 4.
Left panels: synthetic WD populations (grey points) in the Gaia Hertzsprung-Russell diagram considering different prescriptions. The ultramassive Q branch is delimited by solid red lines. Dashed red lines mark the region where we have counted WDs to prepare the histograms. Right panels: synthetic (black line) and observed (red line) histograms for the 100 pc WD population. The observed Q branch can be regarded as the red peak between ζ = 13.0 and ζ = 13.4 in the 100 pc WD sample observed by Gaia.
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