Hi all
   
       I am trying to make a lesion heat map from a group of patients. I have individual maps of the patients and I would like to create a heat map which will show which region on the brain has most overlap among the lesions. How do I do this? I have tried using Marsbar to combine my lesion ROIs but r1+r2 function simply shows all regions under both lesions instead of showing the overlap as a darker region. Pls help!!

Thanks in advance