Fig. 4
Evolution of the birth rate of the merger of CO + He WD pairs for different CO WD mass constraints. The red solid line is for all WD pairs and the green dashed, blue dot-dashed and light-blue dotted lines are for the pairs with a CO WD of ≤0.8 M⊙, ≤0.6 M⊙, and ≤0.55 M⊙, respectively. Two vertical dotted lines mark the delay times of 1 Gyr and 3 Gyr.
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