Figure 11From: Towards scaling laws for subduction initiation on terrestrial planets: constraints from two-dimensional steady-state convection simulationsTop part of a convective cell showing various definitions of the lid base. The lid base defined by the velocity gradient is shown in dashed line, and it matches the temperature lid base defined at T L =T i −3.2θ −1 at around the mid-point. The lid slope is estimated at the mid-point.Back to article page