About this Dataroom
Sunspot Group Numbers for years 1610 to 1995 (Doug Hoyt re-evaluation)
Contains monthly means of Rg with the number of days used to form the means and the standard deviation of the means.
- month - 1..12
- num_of_days - The number of days used to form the means
- mean_rg - Mean Rg
- std_dev - Standard deviation
"-99" means no data for that month.