Molecular abundances with respect to CH₃OH towards G31, G328.2551 A, B, and env, Sgr B2(N), Sgr B2(N2), Sgr B2(N3), Sgr B2(N5), NGC 6334I MM1-i–v and MM2-i–ii, Orion BN/KL A and B, IRAS 16293 A and B, and G+0.693. Different colours represent the different molecules for which the abundances are shown, as indicated in the legend in the upper-left corner. Data are taken from: G31 (this work, Mininni et al. in prep.), G328.2551 (Csengeri et al. 2019), Sgr B2(N) (Belloche et al. 2013), Sgr B2(N2) (Belloche et al. 2016, 2017), Sgr B2(N3) and Sgr B2(N5) (Bonfand et al. 2019), NGC 6334I (Bøgelund et al. 2018; Ligterink et al. 2020), Orion BN/KL A and B (Cernicharo et al. 2016), IRAS 16293 A (Ligterink et al. 2017; Manigand et al. 2020), IRAS 16293 B (Ligterink et al. 2017, 2018; Jørgensen et al. 2018), and G+0.693 (Zeng et al. 2018; Rodríguez-Almeida et al. 2021) (from the left to the right).