createIntegral in Roofit


I am finding that the command createIntegral is not producing the behavior that I would expect from reading the documentation. When I give the command function .createIntegral(x,NormSet(x)); the documentation would suggest that the area of the function would be 1 because of the NormSet command. However, the area I obtained from this command is far larger than 1.
What have I not understood?

Thanks :slight_smile: