Estimated disk masses versus the protostar mass. The right y-axis corresponds to the dust mass, while the left y-axis corresponds to gas mass calculated assuming a gas-to-dust ratio of 100. The solid line represents a criterion for gravitational instability such that disks above the line are unstable. Empty symbols mark sources with no estimates in the literature of the stellar mass for which we assume M_* = 1 M_⊙. For close binaries for which only the combined protostar mass is reported in the literature we assigned half that mass to each component.