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to phrases
sunspot number
astr.
Relativzahl
f
;
Fleckenrelativzahl
f
life.sc., el.
relative Anzahl von Sonnenflecken
;
Sonnenfleckenrelativzahl nach Wolf
tech.
Sonnenfleckenzahl
n
sunspot number:
8 phrases
in 4 subjects
Communications
1
Life sciences
3
Physics
2
Radio
2
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