A BAGLE model for a PSPL with a parallax with a dark lens of M_L = 1 M_⊙, μ_rel,⊙ = 4 mas yr⁻¹, β = 0.5 mas (closest approach distance), d_L = 3 kpc, d_S = 8 kpc, and observed from Earth toward the bulge. The top panel shows the positions of the lens and the unlensed source. The middle panel shows the two sets of lensed source images. The bottom panel shows the flux-weighted centroid as would be observed on the sky. The circle illustrates the Einstein radius (θ_E = 1.3 mas) centered on the lens position at time t₀ = 57200 MJD.