text: 0  0.5 
  1/2 
  c 
  
  (Color online) Excess free-energy density βf ex 
  v 
  
  FIG. 4: 
  as 
  a function of the square root of the concentration √c. (dia- 
  mond) MC simulations, (dot dashed) MSA2, (dashed) MSA3, 
  (solid) BIMSA3, (dot) DHLL, and (cross) experiments. The 
  inset gives the fraction of pairs (MSA3, BIMSA3) as a func- 
  tion of √c. 