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use Data::Dump 'pp'; # a "better" Data::Dumper

...
88 DET-0 219.421725079137 710.314439572696
88 DET-0 257.837516726887 594.376577764894
88 DET-1 119.630462310966 260.433234269099

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{
  21 => {
...
          "DET-1" => [{ "x" => "119.630462310966", "y" => "260.4332342
+69099" }],
        },
}