Temperature and volume density ranges towards GMC 3 for the species studied here, as well as for other species studied using the ALCHEMI survey measurements. Ranges for HNCO and SiO are taken from Huang et al. (2023), and ranges for all sulphur-bearing species are taken from Bouvier et al. (2024). Note that T(SiO) > 400 K, so its density range is indicated by the vertical black bar. CH₃OH and H₂CO contours encompass the middle 66% of the temperature and density posterior distributions derived from our Bayesian inference procedure.