Selected lines of CH3NCO and CH3CH2NCO in Orion KL and Sgr B2(N) at 3 mm. Observed data (black histogram spectrum) and total model of the source (green curve) are from Tercero et al. (2010) and Cernicharo et al. (2016) for Orion KL and Belloche et al. (2013) for Sgr B2. Model for CH3NCO is given by the blue line (Cernicharo et al. 2016). The synthetic spectrum for CH3CH2NCO corresponding to the upper limit reported in Table 2 is given by the red line. A vLSR of +9.0 and +64.0 km s−1 is assumed for Orion KL and Sgr B2, respectively.
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