/**
* @param plot
*/
private void setYAxisFormat(XYPlot plot) {
NumberAxis yAxis = (NumberAxis) plot.getVerticalAxis();
NumberFormat yAxisFormat = new TimeNumberFormat();
yAxis.setNumberFormatOverride(yAxisFormat);
yAxis.setMinimumAxisValue(0);
yAxis.setMaximumAxisValue(24 * 60 * 60 * 1000);
yAxis.setTickUnit(new NumberTickUnit(2 * 60 * 60 * 1000));
}