(a) Estimates of Ta and for stellar convective oceans and parameter values of the current (red) and previous (green) numerical studies of thermal convection, which are clearly still far from stellar conditions. (b) The same as (a) but for Ta and Pr. The estimated region of stability of the different convective instabilities SC (with stripes), EA (plain), and antisymmetric polar (AP)/SP (cross hatched) is also shown.