FCCanalysis plots function to normalize histograms (backgrounds and signal)

[esitti]

I was able to create some histograms and plots using custom defined functions for my signal and background samples. The thing I need to this normalize the histograms, especiylly the ones for the backgrounds, to the same number events. In general we are also interested in normalizing all the histograms to 1, i.e. the y axis should be normalized to 1 using a method similar to hist.integral maybe?
Thank you in advance!