Fig. 2From: Extremely large flares/multiple large flares expected from sunspot groups with large areaa Yearly sunspot number, yearly number of sunspot areas of more than 1000 MSH, and yearly maximum area of sunspot groups in the DHO catalogue. b Yearly sunspot number, yearly number of sunspot area of more than 1000 MSH, and yearly maximum area of sunspot groups in the MA20 catalogueBack to article page