CavityRadius
This parameter is specific to a set
of simulations performed to evaluate the efficiency of planet trapping
at a cavity edge. Unless you want to reproduce these simulations, you
should simply ignore this variable. If you use it, you also have to
define CavityRatio and CavityWidth. CavityRadius is the approximate
radius of the surface density jump.
Note that CavityRadius can be varied in time
using the LambdaDoubling parameter.