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The observation of a stable doublet pattern in the field-emission electronmicroscopy of a linear atomic chain requires a stable mechanism breaking theaxial symmetry, which is not identified correctly by Mikhailovskij et al.[Phys. Rev. B 80, 165404 (2009)]. Using microscopic calculations, we attributethe observed pattern to the symmetry breaking produced by the ligand where thechain is attached, plus carbon pi-bonding alternation.

Comment to "Imaging the atomic orbitals of carbon atomic chains with field-emission electron microscopy"