Fig. 6.
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Total mass plotted against logarithmic period of DD systems. Pa 13 is shown in red and Hen 2-428 in purple. The black dots are close double WD systems compiled by Munday et al. (2024). The teal dashed-dotted line indicates which systems will merge within a Hubble time, and the black dashed line indicates the Chandrasekhar mass limit.
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