... L1517B

Appendices A-C are only available in electronic form at http://www.edpsciences.org

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... telescope

FCRAO is supported in part by the National Science Foundation under grant AST 94-20159, and is operated with permission of the Metropolitan District Commission, Commonwealth of Massachusetts.

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... cores

Note that the caption of Fig. 13 in Paper I erroneously labels the N₂H⁺ emission in L1498 as red when is blue.

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