Comparison of the different CP spectra after data treatment allowed us to identify transitions from radical species (formamide:F₂/He pressure ratios of 1:0.5, 1:1, 1:2, and 1:3, from top to bottom). The shaded areas correspond to ±200 MHz windows around the spectral predictions from the NCO and H₂NCO radicals (in light blue and orange, respectively). For NCO, predictions are from the CDMS database (Endres et al. 2016) based on the experimental work by Kawaguchi et al. (1985). For H₂NCO, calculated values are from this work and the relative intensity is proportional to the expected line intensity at 300 K, in arbitrary units. Discontinuities in the experimental spectra correspond to very noisy regions that have not been plotted for the sake of clarity.