Synthetic spectrum fitting of COMs towards their emission peaks (V_lsr of each species are corrected according to V_peak from Fig. A.3). The black histograms are the observed spectra, overlaid with a best fit model spectrum for given uniform FWHM linewidth (△ V) (fit from Fig. A.3), T_rot (assumed from an adjacent substructure), and N_mol (adjusted based on N_T in Tables A.5I−A.7I) listed on top of each panel. Blue lines mark the central frequency of each transition. Uncertainties of the fitting to observations come from the assumption that under LTE, the candidate molecule lines are optically thin, and each species has the same line width at different transitions. Referenced molecular data are from CDMS/JPL (Sanchez-Monge 2011; Palau et al. 2011).