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Fig. 1

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Spectra observed in the 214 500–222 200 MHz and 230 200–238 000 MHz range towards L1489–IRS, B5–IRS1, L1455–IRS1, and L1551–IRS5, ordered from top to bottom according to the number of detected lines (see Table 4). Labels of selected detected species (see Sect. 4.1, Figs. A.1–A.4, and Tables A.1–A.4) are reported.
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