Fig. 5.
The orientations of maximum fitness vary with VPM/Vfree, but the SS pattern is that with zero fitness at the equilibrium VPM. (a) The sum of +70/0/−70 degree filaments grew fastest in number at low Nfb and VPM, but only the ±35 degree population remained at SS VPM (standard conditions with σbr = 0 degree and a rigid PM for clarity). (b) The 3D fitness landscape for standard conditions. (c) VPM/Vfree rises with Nfb. (d) A 2D representation of b shows positive (green) or negative (red) fitness at a given velocity and orientation. At low VPM/Vfree, all orientations undergo net reproduction, raising Nfb and VPM/Vfree. The “terminal” VPM is achieved by, and limited to, the ±35 degree family.