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Helium abundance and ionization structure in the Orion nebula: radio recombination lines observations

S. Poppi, A. P. Tsivilev, S. Cortiglioni, G. G. C. Palumbo and R. L. Sorochenko

A&A, 464 3 (2007) 995-1002

Published online: 11 January 2007

DOI: 10.1051/0004-6361:20042323

S. Poppi

A. P. Tsivilev

S. Cortiglioni

G. G. C. Palumbo

R. L. Sorochenko

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