4902 20200610165233.0 CTALK-2020-0118 Clette, Frédéric Reconciling the Sunspot and Group Numbers 2019 2019-06-14 STCE Lefèvre, Laure VARSITI Closing Symposium, Sofia, Bulgaria frederic.clette@observatoire.be http://newserver.stil.bas.bg/VarSITI2019/2019Presenta/Day5-1_Clette_Varsiti_V2.pdf Contributed CTALKCONT