yield     variety
      46.2         1
      51.9         1
      48.7         1
      49.2         2
      58.6         2
      57.4         2
      60.3         3
      58.7         3
      60.4         3
      48.9         4
      51.4         4
      44.6         4
      52.5         5
        54         5
      49.3         5