Microlensing magnification patterns for a population of 0.7 M_⊙ bodies with parameter values of κ_* = 0.39, γ = 0.47 and a point source (left hand panel). Right-hand panel: same simulation but for a source of radius one lt-day. Each frame has a side length of eight Einstein radii in the source plane. The yellow lines indicate tracks across the amplification pattern for the lengths of the B − A and C − A light curves in Fig. 2. A net transverse velocity of 600 km s⁻¹ is assumed (Kayser et al. 1986).