title: Difference on core plot CPTBarPlotFieldBarLocation and CPTBarPlotFieldBarTip?
body: <p>I'm new to core plot and wondering what the difference is on <code>CPTBarPlotFieldBarLocation</code>  and <code>CPTBarPlotFieldBarTip</code>. I have been looking at the core plot example <code>CPTTestApp_ipadViewController</code> and I have seen that both of these field enum are called during filling the ploy with the <code>numberForPlot</code>-method but I don't understand the difference.</p>
  
  <p>Thanks for any help</p>