class TH1D: public TH1, public TArrayD

 Constructor.

    Create a 1-Dim histogram with fix bins of type double

           (see TH1::TH1 for explanation of parameters)

    Create a 1-Dim histogram with variable bins of type double

           (see TH1::TH1 for explanation of parameters)

    Create a 1-Dim histogram with variable bins of type double

           (see TH1::TH1 for explanation of parameters)

 Create a histogram from a TVectorD
 by default the histogram name is "TVectorD" and title = ""

 Destructor.

 Constructor.

 Copy this to newth1

 Draw copy.

 see convention for numbering bins in TH1::GetBin

 Reset.

 Set bin content
 see convention for numbering bins in TH1::GetBin
 In case the bin number is greater than the number of bins and
 the timedisplay option is set or the kCanRebin bit is set,
 the number of bins is automatically doubled to accommodate the new bin

 Set total number of bins including under/overflow
 Reallocate bin contents array

 Operator =