spatial period of a wave English
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    Q21077852 (Deleted Item)
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    Q41364 (Deleted Item)
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    hydrogen line English
    wavelength English
    21.10611405413±0.00000000001000088900582341 http://www.wikidata.org/entity/Q174728
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    Q416254 (Deleted Item)
    1.3687±0.000099999999999988987
    temperature English
    20±1 http://www.wikidata.org/entity/Q25267
    wavelength English
    589±1 http://www.wikidata.org/entity/Q178674
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    Q30303704 (Deleted Item)
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    Q21514353 (Deleted Item)
    Q200323 (Deleted Item)
    Q178674 (Deleted Item)
    Q175821 (Deleted Item)
    Q174789 (Deleted Item)
    Q174728 (Deleted Item)
    Q81454 (Deleted Item)
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