Comment on "Large energy gaps in CaC6 from tunneling spectroscopy:   possible evidence of strong-coupling superconductivity"
  Comment on "Large energy gaps in CaC6 from tunneling spectroscopy: possible evidence of strong-coupling superconductivity" 
N. Emery, C. Herold, S. Cahen, H. Rida, J. F. Mareche, P. Lagrange, G.   Lamura