text: On a more careful look, we found that indiﬀerence of 
  δW (ωc) to the increase of λ is merely the consequence of 
  the fact that above we kept λωsf constant. Indeed, at 
  small frequencies, fermionic self-energy in the NS is Σ′ = 
  λω, Σ” = λ2ω2/(λωsf ), and both Σ′ and Σ′′ increase 
  with λ if we keep λωsf constant. But at frequencies larger 
  than ωsf , which we actually probe by ∆W (ωc), the self- 
  energy essentially depends only on λωsf , and increasing λ 
  but keeping λωsf constant does not bring us closer to the 
  physics associated with the recovery of electron coherence 
  in the SCS. To detect this physics, we need to see how 
  things evolve when we increase λωsf above the scale of 
  ∆ , i.e., consider a truly strong coupling when not only 
  λ ≫ 1 but also the normal state ΣN S(ω ≥ ∆) >> ∆. 