Three examples of simulated microlensing events due to FFP lenses as seen by Euclid and Roman. Shown are (from left to right) the case of a super-Jupiter lens, a Saturn-like lens, and a super-Earth lens. The distance of the source D_s is set at 8 kpc and the true mass M_true and distance D_true of the lenses, as well as the best-fit parameters, are indicated for each case. Those based only on Roman data are presented in brown, while the best-fit solutions using both datasets are shown in black. Using Roman data only, the mass of the lens can be reconstruct accurately only for the longer events. The magnitudes are artificially aligned to the Roman system for the plotting.