Notes. Results from the fitted parameters. Methyl cyanide and isocyanic acid column densities are found from column densities of CH"CN and HN¹³CO using the isotopologue ratios presented in Table E.3. Stars indicate the column densities found from fitting to the weakest clearly detected line (S/N > 3) of HNCO and CH₃CN by fixing the T_ex to the excitation temperature of . For HNCO, this is done when no measurement is possible for the ¹³C isotopologue due to line blending. For CH₃CN this is done either when an upper limit is found on the isotopologue of this species or the detected ¹³C isotopologue lines become more optically thick than the CH₃CN 12₁₀−11₁₀ line. In the latter case, the CH₃CN 12₁₀−11₁₀ line is used for the column density measurement. Where molecules are fitted by eye, the uncertainties on column densities come from the variation seen when the T_ex is changed from its lower limit to its upper limit. If the species are fitted using grid fitting the errors show the 2σ found from the reduced-χ² error calculation. Square brackets around excitation temperatures show where the temperature is fixed in fitting. They are generally fixed to the excitation temperature of except for CH₃NH₂ where the temperature is fixed to 90 K (temperature of CH₃NH₂ in G345.5043+00.3480 is fixed to 60 K as this is the upper limit on T_ex for this source). Square brackets around FWHM show that it is fixed to the FWHM of . The FWHM values of HCN¹³CO are fixed to the FWHM of single HNCO lines. The uncertainties on FWHM are ~0.5 km s⁻¹.