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Arctic sea-ice extent: NSIDC
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September Arctic ice extent (million km2)
Source: JAXA, NSIDC, NSIDC v4, OSI SAF v2.2, <br>OSI SAF v2.3
Source: JAXA, NSIDC, NSIDC v4, OSI SAF v2.2,
OSI SAF v2.3
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