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

GNhs_y.txt (drop last 4 columns)

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

(-1 values indicate "no data")

Col 1: Year
Col 2: Group number Gn
Col 3: Standard error Eg
Col 4: Number of observations