ods for making in a easy way contour , with <tt>TBackCompFitter::Contour</tt>, and scan plots of the objective function, with <tt>TBackCompFitter::Scan</tt>. Both Scan and Contour takes as input a TGraph which on exit will be filled with the scanned or contour points.

  </ul>

  <h4>TH1</h4>
  <ul><li>
  Re-implement <tt>TH1::Fit</tt> using the functions defined in <tt>HFitImpl.cxx</tt>.
    <li>Add new function <tt>TH1::Interpolate</tt> to approximate the value via linear interpolation. Implementation fro