Classification performance on the test sample, restricted to sources appearing point-like in LS10 images. The horizontal axis shows the distance from the S22 photometric classification criterion (with > 0 indicating extragalactic and < 0 Galactic classification). The vertical axis shows our new separating line, for the case where no Gaia information is available (STAREX-noGaia), using the same magnitudes but also the optical type (0 here for point-like) and the soft-band X-ray flux. The recall for secure extragalactic (blue) and Galactic (red) test sources is reported in the left panels, followed by the corresponding purity values. The contours enclose 25%, 75% and 90% of the sources.