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abstraction
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mathematical concept
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number
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quantity
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radiation measurement
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spectral feature
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spectral line
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ionized helium line
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Pickering line
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Pi alpha
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Pi alpha
comparison table
Subject
is a kind of
has wavelength
is an instance of
Pickering line
ionized helium line
Pi alpha
10124 Å
Pickering line
Next Pickering line
:
Pi beta
Up
:
Pickering line