Energy landscape obtained with two models for the repeller molecules. Total energy per plate, E, and membrane energy, Em, calculated via the simulated annealing method applied to compressible repellers (dashed parabolas and solid straight lines, respectively) and from the simplified model for rigid repellers (dotted parabolas and straight lines, respectively). For compressible repellers, two values of Ω are presented (Ω = 0.01 kT/nm2 and Ω = ∞ (dashed and solid, respectively).