What is nbinsx , xbins?

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  • auto is C++ used to declare a variable automatically. here a TH2F
  • >> tells Draw to fill the histogram h2
TH2D::TH2D	(	const char * 	name, // Histogram name
                const char * 	title, // Histogram title
                Int_t 	nbinsx, // number of bins along X 
                const Double_t * 	xbins, // A Vector describing the bins along X - dimension is nbinsx+1
                Int_t 	nbinsy, // number of bins along Y
                const Double_t * 	ybins, // A Vector describing the bins along Y- dimension is nbinsy+1
)