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Original series by Hoyt & Schatten 1998: monthly mean group number info.

GNhs_m.txt (drop last 4 columns)

Monthly mean group number from the original series by Hoyt & Schatten 1998.

(-1 values indicate "no data")

Col 1: Year
Col 2: Month
Col 3: Date in decimal year (middle of month)
Col 4: Group number Gn
Col 5: Standard error Eg
Col 6: Number of observations