Mass profile of A2390 from an SL-only analysis and a joint SL+WL analysis. The two regions that include members+Gaussians (R ≲ 0.44 Mpc) in the lens model or only Gaussian functions are indicated. We also show the range of distances covered by the SL constraints (from the brightest cluster galaxy). For the SL+WL combination, we show a range of models that are consistent with the data (~1 standard deviation). The addition of WL data from Euclid is key to properly constrain the mass of the cluster out to the virial radius (corresponding to R₂₀₀ or to the radius at which the density reaches 200 times the mean density of the Universe) with a vertical orange bar, where the width is the uncertainty in the virial radius.