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Fig. 5.

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Number of hard MBHBs (grey solid) and single MBHs (grey dashed) per deg2 (dN(z)/dΩ, black) as a function of redshift. Different colors represent the same but when the population of MBHBs is divided by semi-major axis (aBH). Each panel corresponds to binaries with different total masses: 104 − 105M (top), 105 − 106M (middle), and 106 − 107M (bottom). Overall, the figure shows that LISA MBHBs represent 0.1%−1% of the MBHs between 104 and 107M.

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