title: different approximation methods (dataGrouping) for each Series in one Highstocks-Chart?
body: <p>Is it possible to set individual approximation methods for multiple line-series in one Highstock-Chart?</p>
  
  <p>Let's say i want to have 'average' dataGrouping on a temperature-line-plot und a custom method on some other line-plots in the same highstock-chart.</p>
  
  <p>Is there a way to do this?</p>