Experimental spectra recorded around the $N_{K_a^{\mathrm{\prime }},K_c^{\mathrm{\prime }}}^{\mathrm{\prime }}-N_{K_a^{\mathrm{\prime }\mathrm{\prime }},K_c^{\mathrm{\prime }\mathrm{\prime }}}^{\mathrm{\prime }\mathrm{\prime }}={15}_{2,14}-{14}_{2,13}$ a-type transition of H₂NCO using source-frequency-modulation spectroscopy (FM, second harmonics detection) and Zee-man modulation spectroscopy (ZM), and comparison with a 300 K simulation obtained with PGOPHER using the final set of spectroscopic parameters (see Table 1) and a Gaussian profile with a full width at half maximum of 1.5 MHz. The bottom panels show an overlap of the experimental spectra in the region highlighted in light blue in the top panel. The grey area in the upmost panel indicates a region where the strong lines of the precursor prevent observation of the radical product using the source-frequency-modulation experiment.