title: Comment on "Repulsive contact interactions make jammed particulate systems inherently nonharmonic".
authors.affiliation: Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
authors.forename: Carl P
authors.initials: CP
authors.lastname: Goodrich
authors.affiliation: Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
authors.forename: Andrea J
authors.initials: AJ
authors.lastname: Liu
authors.affiliation: James Franck and Enrico Fermi Institutes, The University of Chicago, Chicago, Illinois 60637, USA.
authors.forename: Sidney R
authors.initials: SR
authors.lastname: Nagel