Comment: Transfer function in amplitude and phase of mode spacing up-scaled to the optical frequency(N·fFSR), offset signal (f0) and optical line (Vn) measured by modulating QCL-comb current driver. Device: HF2LI Lock-in-Amplifier Company: Zurich Instruments 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