Sunspot drawing of 2018-9-13

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https://doi.org/10.7891/e-manuscripta-160069



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2018-09-13
07:30
Hs 1304.6:11325
https://doi.org/10.7891/e-manuscripta-160069
Observer : Sergio Cortesi
Seeing (SIDC) : 4
No group