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Table A.1.

Parameters d, v, mlens and Mcenter for five possible lensing scenarios given the maximum magnification of A = 6.3 and the combined mass of the two BHs Mcenter + mlens ≈ 5 × 106M.

Scenario 0 Scenario 1 Scenario 2 Scenario 3 Scenario 4
d [ld] 110 160 250 400 1000
v [km s−1] 480 400 320 255 160
mlens 2.5 × 106 M 1.2 × 106 M 4.8     × 105 M 1.9     × 105 M 3 × 104 M
Mcenter 2.5 × 106 M 3.8 × 106 M 4.5     × 106 M 4.86 × 106 M 5.0 × 106 M
Mcenter + mlens 5.0 × 106 M 5.0 × 106 M 4.98 × 106 M 5.05 × 106 M 5.03 × 106 M
torbit [yr] 1178 2050 4050 8131 32155

Notes. The scenarios cover the distance parameter space of 110 ld ≤ d ≤ 1000 ld and, correspondingly, the velocity parameter space of 480 km s−1 ≥ v ≥ 160 km s−1 for the lensing object.

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