Application of the statistical analysis to the series of 84 cycles covering the period between the years 976 and 1888 as reconstructed from ¹⁴C data by (Usoskin et al. 2021). Upper panel: (Corrected) Original method of Gough (1981). Lower panel: modified method (Gough 1983). The graphical representation of the results is the same as in the previous figures. The data are consistent with random walk of phase (case R) while, owing to the much longer data set, clock synchronization is rejected at levels exceeding 99%.