NPE performed at different points in parameter space. XODs are produced from 200 deg² X-ray surveys, selecting clusters with the flux cut CR_lim = 0.02c/s. The posteriors (blue contours) are obtained with the NPE for XODs not seen during the ResNet or NPE trainings. A tested XOD x₀ is compressed into a y₀, the position of which in the parameter space is indicated by a red square. The green star shows the true parameters that were used to simulate x₀.