n old ROOT versions, filling a new THnSparse object in old ROOT versions does NOT WORK!</li>
  <li>
  Add SetBinContent(), AddBinContent(), SetBinError() taking the
  linear bin index. Use it in Projection() for a considerable
  speed-up.</li>
</ul>

<h4>TSpectrum2Painter</h4>
<ul>
<li> New parameter bf() in the SPEC option to define the buffer size
  used by TSpectrum2Painter. It is needed in case of very
  large canvases like 8000x5000.</li>
</ul>


<h4>New TEfficiency class</h4>
<ul>
  <li>
This new clas