title: Yunker et al. reply.
authors.affiliation: Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA and School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Yunker
authors.forename: Matthew A
authors.initials: MA
authors.lastname: Lohr
authors.forename: Tim
authors.initials: T
authors.lastname: Still
authors.forename: Alexei
authors.initials: A
authors.lastname: Borodin
authors.forename: D J
authors.initials: DJ
authors.lastname: Durian
authors.forename: A G
authors.initials: AG
authors.lastname: Yodh