Hrabina J, Hosek M, Rerucha S, Cizek M, Pilat Z, Zucco M, Lazar J, Cip O. Absolute frequencies of H13C14N hydrogen cyanide transitions in the 1.5-µm region with the saturated spectroscopy and a sub-kHz scanning laser. Opt. Lett., 47, 5704?5707 (2022).