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  1. or download this
    use strict;
use warnings;
...
);

$chart->plot3d($dataSet);
  2. or download this
      Warning: Single isoline (scan) is not enough for a pm3d plot.
           Hint: Missing blank lines in the data file? See 'help pm3d'
+ and FAQ.
  3. or download this
    use strict;
use warnings;
...

$chart->plot3d($dataSet);