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use strict;
use warnings;
...

# Plot the data set on the chart
$chart->plot2d($dataSet);

                                                                      
+        
                                   Simple testing                     
+         
                                                                      
+         
...
       0 +------------------------------------------------------------
+-----+   
         1      1.5       2      2.5      3      3.5       4      4.5 
+     5   
                                   My x-axis label