Sunspot drawing of 2018-4-11

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https://doi.org/10.7891/e-manuscripta-160071



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2018-04-11
07:00
Hs 1304.6:11188
https://doi.org/10.7891/e-manuscripta-160071
Observer : Marco Cagnotti
Seeing (SIDC) : 4
No group