HIGHLIGHTS
SUMMARY
F. Clette et_al Questions were raised about the validity of the methods used (Usoskin et_al, 2016; Lockwood et_al, 2016) and new ideas for recalibration emerged. Earlier studies confirmed the specificity of this transition (Svalgaard, 2013; Cliver and Ling, 2016; Cliver, 2017; Bhattacharya et_al, 2021, 2023). Nonlinear probability distribution functions (Usoskin et_al, 2016; Chatzistergos et_al, 2017), developed so far for the group number (described in Section 2.2.2), could also be applied after adapting them to the sunspot number. As a related development, within the past decade, the Historical Archive of Sunspot Observations (HASO . . .
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