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                        Figure Caption
                    
                    
                
                
            
        
        
    
        
            
            
Fig 1
Distributions of the number of cells in the considered images.
        
    
        
        
    
    
    The top histogram shows the distribution for the whole data set, and the bottom histograms show the distributions for the low, medium, and high levels of complexity. In a range of 18 to 661 cells, the majority of images had at most 250 cells. Only eleven images had fewer than 50 cells, and nineteen images had more than 250.
                
                    
                        Acknowledgments
                    
                    
                
                
            
        
        
    
        
            
            
                
                    
                        
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