[Chimera-users] Command line equivalence for Render by Attribute radii

Hello, I cannot seem to find the command line equivalence for Render by Attribute radii. I am trying to display a tunnel where the atom B-factors represent the tunnel radius. I am able to display the tunnel as expected by using the GUI. In the GUI, when I do Tools --> Depiction --> Render by Attribute --> atoms --> My Model; then Render Attribute --> bfactor; Radii --> Atom Style --> Sphere, I get the expected result of the tunnel diameter varying according to Bfactor (tunnel radius). What is the command line equivalence for doing this? I cannot seem to find it. Thank you for looking into this.