read data                                                                                                                    
                                                                                                                                                                              
                                                                                                                                                                              
                                                                                                                                                                              
                                                                                                                                                                              
                                                                                                                                                                              
                     generate diagrams                                                                                                                                        
                                                                                                                                                                              
                                                                                                                                                                              
                                                                                                                                                                              
                                                                                                                                                                           yes
                                                 more data?                                                                                                                   
                                                                                                                                                                              
                                                                                                                                                                              
                                                                                                            no