HS(1₁₀–1₀₁) line at 167910.516 MHz together with the main isotopologue HS line divided by 10 and observed in the same FTS spectrum between 13.0 and 17.0 Dec 2018. The vertical scale is the main beam brightness temperature, and the horizontal scale is the Doppler velocity in the comet rest frame. The feature at − 11 km s⁻¹ does not correspond to any known molecular line and could be spurious.