Distribution of BH XRTs (black circles) and CVs (triangles) in the FWHM-P_orb plane. Open triangles indicate eclipsing CVs, while filled triangles non-eclipsing CVs. Red triangles represent 43 CVs from C15 and blue or cyan, green, and yellow triangles the 305 SDSS CVs of dwarf novae, magnetic, and nova-like types, respectively (Inight et al. 2023). For reference, we indicate the maximum FWHM for a Chandrasekhar-mass white dwarf viewed edge-on, and the lower limit of the FWHM for accretion disc eclipses of a typical 0.82 M_⊙ CV white dwarf (dotted line). We also plot the maximum FWHM of a 2.3 M_⊙ neutron star viewed edge-on. The expected track of a canonical 7.8 M_⊙ BH seen at 60° inclination is represented by the dashed line.