Temperature (left) and stress fields (right) of a steady-state convective cell. Color scale goes from high (red) to low (blue). The lid is defined by an isotherm T
, and the interior temperature T
is found by averaging the temperature of the convecting interior excluding boundary effects. For scaling purposes, the lid slope λ and rheological sublayer thickness δ
is taken at mid-width, whereas lid thickness δ
lid is extrapolated to the edge from the lid slope in the middle.