Molecular abundances normalized with respected to the abundance of CH₃OH. The boxes denote the first to third quartiles while the caps mark the full range of abundances in our slim filaments. The median of abundances of each molecule is marked by a horizontal orange line. The abundances of the outflow from a high-mass protostar IRAS 20126+4104 (Palau et al. 2017), and of the dense cores (Paper I) and outflows (Paper II) in the CMZ are also plotted. The systematic uncertainties in the abundances are not plotted here.