Comment: Frequency dependence of the sum of the complex coherences between offset frequency (f0) and mode spacing (fFSR) in the free-running QCL comb Uploaded by: Atif Shehzad Affiliation: Laboratoire Temps-Frequence, Institut de Physique, Universite de Neuchatel, Avenue de Bellevaux 51, 2000 Neuchatel, Switzerland Contact: atif.shehzad@unine.ch Upload date: 20-02-2020