Hi, ROOTers I need to fit simultaneously several non intersected parts (subranges) of histogram with single function. In my case it is linear backround, which is approximated by "pol1" function through all the spectrum. And ONE fit must be done SIMULTANEOUSLY over SEVERAL subranges of this spectrum, where we have pure background. I can't fit ALL the spectrum due to a lot of lines with unknown structure. How can I do this? Is there possibility to skeep some histogram bins during fitting? Best wishes, Yuriy.
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