Histogram splitting and TSpectrum::Background

Hi list,

   i have an histogram as shown in the attached picture. I would like to estimate the background of these signals using TSpectrum::Background. As you can see from the image the background is correctly estimated starting from channel ~47000 since the absence of signals in the region between ~20000 and ~43000, and before ~17000 is hindering the correct determination of the background where the signal is present.
In order to correct for this phenomenon i would like to produce a code where this kind of histogram is currently splitted into two different histograms that containts only the bins which are different from -250. Is it possible to perform this task using a predefined ROOT function or do i have to do it by my own?
And secondly, it is correct that is not possible to tell TSpectrum::Background to evaluate the background in specified zones only?

Sorry for the lenghty question,
Regards,
Marco Received on Sun Jun 25 2006 - 21:12:42 MEST