Source and lens trajectories for a simulated binary-source binary-lens microlensing event with circular orbits. The orange line is the primary source, the pink line is the secondary source, the black line is the primary lens, the purple line is the secondary lens, and the yellow lines are the image positions. The green line is the flux-weighted average of lensed source positions, as observed on the sky. Note that mag_S,pri = 16 and mag_S,sec = 17. The Einstein radius is 4.9 mas. The simulation was run with t_E = 231.15 days. The following orbital parameters were used for the lens: ω_pri = 30°, Ω_sec = 10°, i = 90°, e = 0.2, and P = 2722.46 days. The following orbital parameters were used for the source: ω_pri = 30°, Ω_sec = 10°, i = 90°, e = 0.4, and P = 6000 days. The lenses have respective masses of m_L,p =  10 M_⊙ and m_L,s =  8 M_⊙.