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Fig. 2
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Spectra of CH3CHO(51,4−41,3)A and NH2CHO(40,4−30,3) averaged over the three polygons defined in Fig. 1 for the shocked regions B0, B1, and B2. The dashed vertical line and the green horizontal line mark, respectively, the systemic velocity of L1157-mm (Vlsr = 2.6 km s−1) and the zero-intensity level of each spectrum.
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