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 getMinimum( )
	{
		return oMinimum;
	}
	/**
	 * @param o
	 */
	public final void setMinimum( Object o )
	{
		this.oMinimum = o;
	}
	/**
	 * 
	 * @return
	 */
	public final Object getMaximum( )
	{
		return oMaximum;
	}
	/**
	 * @param o
	 */
	public final void setMaximum( Object o )
	{
		this.oMaximum = o;
	}
	/**
	 * 
	 * @return step size