"The electron-phonon interaction is, besides the Coulomb interaction, one of the fundamental interactions of quasiparticles in solids. It plays an important role for a variety of physical phenomena. In particular in metals, low-energy electronic excitations are strongly modified by the coupling to lattice vibrations, which influences, e.g., their transport and thermodynamic properties. Electron-phonon coupling (EPC) also provides in a fundamental way an attractive electron-electron interaction, which is always present and, in many metals, is the origin of the electron pairing underlying the macroscopic quantum phenomenon of superconductivity" . . In an ensemble of nanotubes, with different chirality, we can always find a sharp G + peak about 1590 cm -1 , whereas "the lineshape and position of the G -peak vary with excitation energy" (Telg et al.). In semiconducting nanotubes, in resonance G -is similar to G + ; "when metallic tubes are coming into resonance the intensity of G -increases, the peak shifts to lower energies, becomes broader and symmetric". The origin of the peaks in metallic nanotubes and the symmetric lineshape, in 2008, was still under debate and therefore, in Telg et al., we find the literature we have previously reported. "Initially the origin of metallic lineshape of the HEM was assumed to be electron-plasmon coupling in metallic nanotubes. It was suggested that in a bundle of metallic nanotubes, a continuum of plasmon states coupled to the TO phonon gives rise to the Fano lineshape, … broadened, downshifted and asymmetric. Referring to this model the lineshape in an isolated nanotube should be similar to the spectrum of a semi-conducting nanotube, since the continuum of plasmons is solely present in nanotube bundles. Another model predicts a strong electron-phonon coupling in metallic nanotubes. As a result the LO-phonon is drastically downshifted below the frequency of the TO-phonon. Additionally this predicts a broad peak which is asymmetric due to the phonon coupling to the continuum of electrons close to the Fermi-level. In contrast to the model of an electron-plasmon coupling these effects should be visible in a bundle of metallic nanotubes as well as an isolated metallic nanotube" , and references therein).