The impact of blending on the photometry (top panel) and astrometry (middle, bottom panels) for a microlensing event. In this case, all blending is assumed to come from a luminous lens. The complete set of model parameters for the PSPL_PhotAstrom_Par_Param1 model shown is M_L = 1 M_⊙, t_0,⊙ = 57000 MJD, X_S,0,⊙ = [0″, 0″], β = 0.4 mas, ﹩{{\boldsymbol{\mu }}}_{{\bf{S}}}=[0,0]﹩ mas yr⁻¹, ﹩{{\boldsymbol{\mu }}}_{{\rm{L}}}=[5,0]﹩ mas yr⁻¹, d_L = 2 kpc, d_S = 6 kpc, α_L = 262﹩\mathop{.}\limits^{\unicode{x000b0}}﹩5, and δ_L = −29°. Note, in the middle panel, the orange line is under the dark purple line.