Normalization of TF1 (function) for log likelihood unbinned fit method


I am trying to apply the loglikelihood fit method for unbinned data (from TTree’s). My function is a little complex with sum of many exponential and others. And there are three functions to fit three sets of the branch with some common parameters (similar to combined fit technique). Here, I am facing problem to normalize the function and to implement it to ROOT:Fit. Is there is any example or documentation which can help me to solve this.


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