en hydrogen line (n)
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en radio astronomy Source: English Wiktionary
en hydrogen line (n)
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en wavelength Source: English Wiktionary
en hydrogen line (n)
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en spectral line Source: English Wiktionary
de wasserstofflinie (n)
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en hydrogen line Source: English Wiktionary
en hydrogen line (n)
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Weight: 1.0
en atomic Source: English Wiktionary