Radial profile of the stability parameter Q. For Elias29 in the upper panel an extended disk model is assumed (Rout = 300 AU), while in the central panel a compact disk model is assumed (Rout = 15 AU). In the first case, in the outer regions of the disk Q approaches unity, showing marginal stability. In the second case, the value of Q drops below unity, showing the presence of strong gravitational instability. In the bottom panel a compact disk model is assumed (Rout = 30 AU) for WL12. In this case Q also assumes very low values, showing that prominent gravitational instability is present.
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