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/(.(?1)(*F))/
/(.*)(*F)/

  1.4 +-------------------------------------------------+
      |      +      +      +       +      +      +      |
...
    0 +-------------------------------------------------+
    1e+07  2e+07  3e+07  4e+07   5e+07  6e+07  7e+07  8e+07

use strict;
use warnings;
...
    $chart-> plot2d( @datasets );
}