

   MMoonntthhllyy MMeeaann RReellaattiivvee SSuunnssppoott NNuummbbeerrss

        data(sunspots)

   FFoorrmmaatt::

        A time series of monthly data from 1749 to 1983.

   DDeessccrriippttiioonn::

        Monthly sunspot numbers from 1749 to 1983. Collected at
        Swiss Federal Observatory, Zurich until 1960, then
        Tokyo Astronomical Observatory.

   SSoouurrccee::

        D. F. Andrews and A. M. Herzberg (1985).  Data: A Col-
        lection of Problems from Many Fields for the Student
        and Research Worker.  New York: Springer-Verlag.

