Title: Free-Running Ring Quantum Cascade Laser with 50 kHz Linewidth Uploaded by: Alexandre Parriaux Affiliation: Laboratoire Temps-Frequence (LTF), Institut de Physique, Universite de Neuchatel, Avenue de Bellevaux 51, 2000 Neuchatel, Switzerland Contact: alexandre.parriaux@unine.ch Upload date: 16/12/2025 File naming: FigX_x_[description].txt The file corresponds to figure number X, panel x (if applicable) of the corresponding manuscript. The description [description] specifies the plot data, which should be clear from reading the manuscript. If necessary, additional information can be found in different README.txt files.