Orion Bar spectra (black) at different frequencies in the 1 mm range. For each line, the spectrum towards Orion BN/KL is also shown in red (Tercero et al. 2010, 2015). The CH₃OH spectra towards Orion BN/KL have been divided by ~400, and the H₂CS spectra by ~200. The black and red dashed lines indicate the LSR velocity of the Orion Bar PDR (10.7 km s^-1) and Orion extended ridge and/or south hot core (~8 km s^-1, see e.g. Cernicharo et al. 2016), respectively.