Minor improvement boxplott visualization in PAVO

tools.descartes.pavo/src/tools/descartes/pavo/types/BoxPlot.java

@@ -38,6 +38,7 @@ import org.jfree.chart.axis.CategoryAxis;
 import org.jfree.chart.axis.NumberAxis;
 import org.jfree.chart.plot.CategoryPlot;
 import org.jfree.chart.renderer.category.BoxAndWhiskerRenderer;
+import org.jfree.data.Range;
 import org.jfree.data.statistics.DefaultBoxAndWhiskerCategoryDataset;
 
 import tools.descartes.pavo.controller.VisualizationController;
@@ -84,6 +85,9 @@ public class BoxPlot extends AbstractVisualizationType implements IVisualization
 
 		plot.setRangeGridlinePaint(Color.lightGray);
 		plot.setDomainGridlinePaint(Color.lightGray);
+		NumberAxis axis = ((NumberAxis)plot.getRangeAxis());
+		axis.setRange(new Range(0, axis.getRange().getUpperBound()*1.4));
+		axis.setUpperBound(axis.getRange().getUpperBound()*1.4);
 		return chart;
 	}