text: 0.2 
  0.4 
  ω 
  c 
  0.6 
   in eV 
  0.8 
  
  FIG. 9: ∆W vs the cut-oﬀ for the EB model. It remains neg- 
  ative for larger cut-oﬀs. Parameters are the same as before. 
  The dot indicates the value of ∆W (  ) = ∆WK 
  ∞ 
  
  of the lattice (the dashed line in Fig. 9). 