Left: relative class probabilities in log₁₀ t_E–log₁₀ π_E, i.e. the space of observables that is accessible from photometric observations alone. The probability map was constructed using all photometrically detectable events. Right: relative class probabilities in log₁₀ t_E–log₁₀ θ_E, i.e. the space of observables that can be measured with high precision with the combination of photometry and astrometry. The probability map was constructed using all photometrically and astrometrically detectable events. Each relative probability map is presented for v_kick = 150 km/s (top) and 450 km/s (bottom). High v_kick results in a parameter distribution that is more distinguishable from other lens classes. In particular, in the log₁₀ t_E–log₁₀ θ_E space, there is a region preferentially occupied by NSs, which reaches p(NS|ϕ, 𝒢) ≈ 1 and could be used for constructing optimal samples of isolated NS candidates. (For clarity, the WD and BH lens class probabilities are not plotted, as the Star class is the main source of confusion with the NS class.)