Our light-curve analysis revealed that all four binaries are detached systems.
The determination of q for detached systems from the χ2 dependence on the
mass ratio is always problematic and can be in disagreement with the q found
from spectroscopy. For GW Car, the mass ratio lower than 0.6 provides a semi-
detached configuration with the smaller component filling its Roche lobe. On
the other hand, the χ2 reached minimum for the mass ratio q = 0.65, suggesting
that the smaller component is detached from its Roche lobe. Therefore, we have
classified GW Car as an almost semi-detached system. The spectroscopic mass
ratio of GW Car is highly desirable to resolve the problem of configuration of
the system.