Bug 212371 [Regression] Auto-scale does not work correctly and gridline is not shown anymore when run the attached java file [13]
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/computation/withaxes/AutoScale.java
*/
	public final Object getStep( )
	{
		return oStep;
	}
	/**
	 * @param o
	 */
	public final void setStep( Object o )
	{
		this.oStep = o;
	}
	/**
	 * 
	 * @return step number
	 */
	public final Integer getStepNumber( )
	{
		return oStepNumber;
	}
	public final void setStepNumber( Integer o )
	{
		this.oStepNumber = o;
	}
	/**
	 * 
	 * @return
	 */
	final Object[] getMinMax( ) throws ChartException
	{