The covalent nature and the sharpness of the DOS near the Fermi level in K3C6O6 suggests to us a potential for large electron-phonon coupling. To see why, we remind that the dispersion of the frontier π-bands, and hence the number of states at the Fermi level are sensitive to the distance between rhodizonates. We can, therefore, anticipate electron phonon coupling to be driven largely by low-frequency motions of rhodizonates with respect to each other. Figure shows the frequency resolved Eliashberg spectral function along with the cumulative electron phonon coupling parameter, λ. As expected, a majority (two thirds) of the λ value derives from inter-ring displacement modes (at ∼330 cm -1 ) that couple to electrons involved in inter-ring (or pancake) bonding.