the introduction to the output file specfun_sup.phon?

[Ydhuang123]

Real Sigma(w)[meV] is the real part of phonon self-energy. But what's meaning of the Im Sigma(w=0)[meV] ? How to get the phonon frequency due to phonon self-energy?

#Phonon eigenenergies + real and im part of phonon self-energy (meV)
#Q-point Mode w_q[eV] w[eV] Real Sigma(w)[meV] Im Sigma(w=0)[meV] Im Sigma(w)[meV]
1 1 0.00001 -4.00000 0.00000000000000E+00 0.00000000000000E+00 0.00000000000000E+00
1 2 0.00001 -4.00000 0.00000000000000E+00 0.00000000000000E+00 0.00000000000000E+00
1 3 0.00001 -4.00000 0.00000000000000E+00 0.00000000000000E+00 0.00000000000000E+00
1 4 0.10969 -4.00000 0.29911194127804E+02 0.26943572662139E+02 -0.45557189194809E-01
1 5 0.19332 -4.00000 0.69885820875584E+02 0.38028685305965E+02 -0.40507882947431E+02
1 6 0.19332 -4.00000 0.73446679610137E+02 0.38138369639346E+02 -0.29874179540063E+02
1 1 0.00001 -3.94949 0.00000000000000E+00 0.00000000000000E+00 0.00000000000000E+00
1 2 0.00001 -3.94949 0.00000000000000E+00 0.00000000000000E+00 0.00000000000000E+00
1 3 0.00001 -3.94949 0.00000000000000E+00 0.00000000000000E+00 0.00000000000000E+00
1 4 0.10969 -3.94949 0.29903347633155E+02 0.26943572662139E+02 -0.24892474055891E+00
1 5 0.19332 -3.94949 0.67389045874941E+02 0.38028685305965E+02 -0.19864724032158E+02
1 6 0.19332 -3.94949 0.68901201324574E+02 0.38138369639346E+02 -0.18130205844118E+02
1 1 0.00001 -3.89899 0.00000000000000E+00 0.00000000000000E+00 0.00000000000000E+00
1 2 0.00001 -3.89899 0.00000000000000E+00 0.00000000000000E+00 0.00000000000000E+00