How to set the begining value of the ireport graph

[Tz4Bu]

I want to set the minimum value of the ireport graph instead of the beginning value which is "0" . Here is a picture of the graph:[1] (http://img15.hostingpics.net/pics/572657graphe.jpg)and the code where I initialize the graph with default values:\[code\] if (jcomboAnnee.getSelectedItem() != null) { for (int i = 1; i <= 12; i++) { series.add(new Month(i, Integer.valueOf(jcomboAnnee.getSelectedItem().toString())), 0); }\[/code\]