title: Android AChartEngine : SalesComparisonChart lines do not reach the exact value
body: <p>i am using AChartEngine library for android and i am drawing a chart using SalesComparisonChart class. but i noticed that the lines drawn does not reach the same value in number, it is drawn below the exact value like below in the photo . in category Oriental the value is 3608 and 4358 but the lines are below those values. Can someone help me ?</p>
  
  <p><img src="https://i.stack.imgur.com/HW2KK.jpg" alt="enter image description here"></p>