Sky map of a LISA source at z ∼ 2 in the simulated universe. The left panel displays the case of a M_Bin = 10⁵ − 10⁶ M_⊙ LISA MBHB, and the right panel corresponds to a MBHB of 10⁶ − 10⁷ M_⊙. Each dot corresponds to a galaxy with a mass of 10⁸ < M_stellar < 10⁹ M_⊙ whose distance to the LISA source is smaller than 8 Mpc. Black dots represent galaxies that never experienced a merger or a merger that happened more than 2 Gyr ago. Red dots correspond to galaxies that experienced at least one major merger in the last 2 Gyr. Blue dots display the galaxies that experience a merger with a mass ratio of 0.01 < m_R < 0.2 in the last 2 Gyr.