read data                                                                                                                                                             
                                                                                                                                                                                                                       
                                                                                                                                                                                                                       
                                                                                                                                                                                                                       
                                                                                                                                                                                                                       
                                                                                                                                                                                                                       
                     generate diagrams                                                                                                                                                                                 
                                                                                                                                                                                                                       
                                                                                                                                                                                                                       
                                                                                                                                                                                                                       
                                                                                                                                                                           yes                                         
                                                 more data?