Fig. 6
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Undetected transitions of H2NCO that were used to determine the column density upper limits. The ALMA observed spectrum of IRAS 16293 B is in black. The LTE model for Tex = 300 K is in red, while the one for Tex = 125 K is in blue. The dotted cyan line corresponds to the 3 rms level per 1 km s−1, 1 km s−1 being the typical line width at this position.
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