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Problem in understanding the Complex code

I am a newbie.
I was reading a code for the background elimination but unable to understand the code properly.

TSpectrum *s = new TSpectrum();
for (i = 0; i < nbins; i++) source[i]=back->GetBinContent(i + 1);
for (i = 0; i < nbins; i++) d1->SetBinContent(i + 1,source[i]);

Elaborate a bit more.
Thanks in advance.

ROOT Version: 6.14
Platform: Ubuntu

TSpectrum manual

Thanks for your response @Wile_E_Coyote.
TFile *f = new TFile(file.Data());
TH1F back = (TH1F) f->Get(“back3”);
if i try to have the data points from the graph which already has all the points contained in it.
as i have
TGraph *g = new TGraph(“sample.txt”);
Int_t n = g->GetN();

then how does this code should be modified?
TH1F back = (TH1F) f->Get(“back3”);


TGraph *g = new TGraph("sample.txt");
TSpectrum *s = new TSpectrum();
s->Background(g->GetY(), g->GetN(),
              10, TSpectrum::kBackDecreasingWindow,
              TSpectrum::kBackOrder8, kTRUE,
              TSpectrum::kBackSmoothing5, kTRUE);

Thanks @Wile_E_Coyote

I don’t know whether it is fine or not?
and i don’t understand why these lines are gone below zero (see near 2000 or 4000…)
Also, don’t know where does initial histogram has gone?

Is the above code useful for background elimination?
As my histogram also comprises of fitted peaks.
How should i combine this code with histogram of the same file that i have drawn earlier?

May be i have got something. please look at it once.
Tell me how should i modify the limit of y-axis.

I am already using:
h->SetMaximum(1000.);//along Y