How can I retrieve the background data from spectrum

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Thanks @Wile_E_Coyote.
please tell me about this blue line also.

// Estimate the background

s->Background(source,nbins,6,TSpectrum::kBackIncreasingWindow,

TSpectrum::kBackOrder2,kFALSE,

TSpectrum::kBackSmoothing3,kFALSE);

// Draw the estimated background

for (i = 0; i < nbins; i++) d->SetBinContent(i + 1,source[i]);

d->SetLineColor(kRed);

d->Draw(“SAME L”);

In Example 1 script Background_incr.C:

  1. they are estimating the background and then they are drawing it.
    In the same way, I am thinking that this blue line is showing the estimated background.
    Am I right? If not then please correct me.