Output of workspace->Print()

Roofit and RooStats
1

Hello,

I am learning RooFit and RooStats.
I don’t get the output of the pdf part when I do workspace->Print()
for example I get something like

p.d.f.s
-------
RooGenericPdf::H0[ actualVars=(x,lambda0) formula="exp(-lambda0*x)" ] = 0.00673795

What is the number 0.00673795?
I thought it was the normalization factor but it isn’t

Thank you for your help