c:\test>junk2
{
  "Data Set 1" =>{ "X units" =>["x1","x2","x3"], "Y units" =>["y1","y2","y3"] },
  "Data Set 2" =>{ "X units" =>["x1","x2","x3"], "Y units" =>["y1","y2","y3"] },
  "Data Set 3" =>{ "X units" =>["x1","x2","x3"], "Y units" =>["y1","y2","y3"] },
}
DS3-X == x3, DS1-Y == y3