Orbital period vs. visible star’s radius for compact object candidates with f(M₁) > 0.05 M_⊙. The radii are obtained from Gaia DR3. The dashed line corresponds to V_rot = 60 km s⁻¹. The sources above the line are shown as blue points for signal-to-noise ratio (SNR) < 30, red points for SNR > 30, and a red triangle for double-lined spectroscopic binaries. Three identified candidates, J2354 (L.-L. Zheng et al. 2023), J1729 (L.-L. Zheng et al. 2022), and J0419 (Z.-X. Zhang et al. 2022), are highlighted with star markers.