...

We refer to the $1\sigma$ uncertainty in the correlation coefficients by $\delta$ in order to avoid confusion with the standard deviation of the cycle-integrated sunspot distribution introduced in Eq. (6).

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

...

A similar analysis using just Greenwich data, in order to avoid any uncertainty introduced by imperfect intercalibration between sunspot data sets, gives basically the same results.

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.