ner_tags: O O O O O B-Person I-Person I-Person B-Observatory I-Observatory O O O O O O O O B-Person O B-Person O O O O O B-Organization I-Organization I-Organization I-Organization I-Organization O B-Grant O O O O O B-Grant I-Grant I-Grant I-Grant B-Person O O O O B-Organization B-Location O B-Grant I-Grant I-Grant
tokens: The authors are thankful to A. A. Osipova (Pulkovo Observatory) for preparing sunspot data for Table 1 . AN and LK acknowledge the support by the Russian Foundation for Basic Research (project 17-52-80064_BRICS) and by budgetary funding of Basic Research programme II.16. DB acknowledges the support from DST, India for BRICS project grant.