rope weight     y
    7      3  28.0
    7      3  31.0
    7      3  32.0
    7      5  81.0
    7      5  79.5
    7      5  85.0
    7      7  88.0
    7      7  77.0
    7      7  81.0
    7      9 102.0
    7      9  93.0
    7      9  95.0
    8      3  25.0
    8      3  26.0
    8      3  23.0
    8      5  60.0
    8      5  58.0
    8      5  59.0
    8      7  86.0
    8      7  88.0
    8      7  82.0
    8      9 113.0
    8      9  96.0
    8      9 105.0
    9      3  26.0
    9      3  23.0
    9      3  24.5
    9      5  54.5
    9      5  63.0
    9      5  60.0
    9      7  93.0
    9      7  86.5
    9      7  90.0
    9      9 104.0
    9      9 105.0
    9      9  97.0
   10      3  12.0
   10      3  11.5
   10      3  13.0
   10      5  20.0
   10      5  19.0
   10      5  23.0
   10      7  33.0
   10      7  28.0
   10      7  27.0
   10      9  62.0
   10      9  70.0
   10      9  66.0