Fig. 3.

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Progression of cumulative selections employed to derive a sample of well-measured WDs along ω Cen’s WD CS. The sequence progresses from left to right, with the top panels representing real stars and the bottom panels representing ASs. The number of real stars after each selection is reported in the bottom left of the panels. In panel (a1), a magenta line indicates where ASs were introduced. Panels (c) display the resulting completeness, depicted as (c1), without, and (c2), with, the inclusion of the selection on RADXS, a highly effective parameter for identifying well-measured point sources. Panel (s1) illustrates the impact of RADXS selection on stars both within and outside the defined WD region, enclosed by two green lines (see text for details). Lastly, in panel (s2), a direct comparison between real and artificial stars reveals no distinct decline in the number of ASs below mF606W ∼ 30.1.
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