| $1.29333251$ $\pm0.00000038$ |  |  | RVUE | 
                                    
                                    
                                    
| • • • We do not use the following data for averages, fits, limits, etc. • • • | 
                                                
                                                    
                                                    
                                                        
                                                        
                                                            | $1.29333236$ $\pm0.00000046$ | 1 |  | RVUE | 
                                    
                                    
                                    
                                                
                                                    
                                                    
                                                        
                                                        
                                                            | $1.29333205$ $\pm0.00000051$ | 2 |  | RVUE | 
                                    
                                    
                                    
                                                
                                                    
                                                    
                                                        
                                                        
                                                            | $1.29333217$ $\pm0.00000042$ | 3 |  | RVUE | 
                                    
                                    
                                    
                                                
                                                    
                                                    
                                                        
                                                        
                                                            | $1.29333214$ $\pm0.00000043$ | 4 |  | RVUE | 
                                    
                                    
                                    
                                                
                                                    
                                                    
                                                        
                                                        
                                                            | $1.2933317$ $\pm0.0000005$ | 5 |  | RVUE | 
                                    
                                    
                                    
                                                
                                                    
                                                    
                                                        
                                                        
                                                            | $1.2933318$ $\pm0.0000005$ | 6 |  | RVUE | 
                                    
                                    
                                    
                                                
                                                    
                                                    
                                                        
                                                        
                                                            | $1.293318$ $\pm0.000009$ | 7 |  | RVUE | 
                                    
                                    
                                    
                                                
                                                    
                                                    
                                                        
                                                        
                                                            | $1.2933328$ $\pm0.0000072$ |  |  | SPEC | 
                                    
                                    
                                    
                                                
                                                    
                                                    
                                                        
                                                        
                                                            | $1.293429$ $\pm0.000036$ |  |  | RVUE | 
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                       
                                        
                                            | 1 
                                                
                                                    
                                                        
                                                    
                                                        
                                                    
                                                     The 2018 CODATA mass difference in $\mathit u$ is ${\mathit m}_{{{\mathit n}}}{\mathit m}_{{{\mathit p}}}$ = 1.388$~449~33(49){\times }10^{-3}\mathit u$. | 
                                      
                                        
                                    
                                       
                                        
                                            | 2 
                                                
                                                    
                                                        
                                                    
                                                        
                                                    
                                                     The 2014 CODATA mass difference in $\mathit u$ is ${\mathit m}_{{{\mathit n}}}{\mathit m}_{{{\mathit p}}}$ = 1.388$~449~00(51){\times }10^{-3}\mathit u$. | 
                                      
                                        
                                    
                                       
                                        
                                            | 3 
                                                
                                                    
                                                        
                                                    
                                                     The 2010 CODATA mass difference in $\mathit u$ is ${\mathit m}_{{{\mathit n}}}{\mathit m}_{{{\mathit p}}}$ = 1.388$~449~19(45){\times }10^{-3}\mathit u$. | 
                                      
                                        
                                    
                                       
                                        
                                            | 4 
                                                
                                                    
                                                        
                                                    
                                                        
                                                    
                                                     Calculated by us from the MOHR 2008 ratio ${\mathit m}_{{{\mathit n}}}/{\mathit m}_{{{\mathit p}}}$ = 1.00137841918(46). In u, ${\mathit m}_{{{\mathit n}}}{\mathit m}_{{{\mathit p}}}$ = 1.38844920(46)${\times }10^{-3}~$u. | 
                                      
                                        
                                    
                                       
                                        
                                            | 5 
                                                
                                                    
                                                        
                                                    
                                                        
                                                    
                                                     Calculated by us from the MOHR 2005 ratio ${\mathit m}_{{{\mathit n}}}/{\mathit m}_{{{\mathit p}}}$ = $1.00137841870$ $\pm0.00000000058$. In u, ${\mathit m}_{{{\mathit n}}}{\mathit m}_{{{\mathit p}}}$ = ($1.3884487$ $\pm0.0000006$) $ \times 10^{-3}~$u. | 
                                      
                                        
                                    
                                       
                                        
                                            | 6 
                                                
                                                    
                                                        
                                                    
                                                        
                                                    
                                                        
                                                    
                                                     Calculated by us from the MOHR 1999 ratio ${\mathit m}_{{{\mathit n}}}/{\mathit m}_{{{\mathit p}}}$ = $1.00137841887$ $\pm0.00000000058$. In u, ${\mathit m}_{{{\mathit n}}}{\mathit m}_{{{\mathit p}}}$ = ($1.3884489$ $\pm0.0000006){\times }10^{-3}~$u. | 
                                      
                                        
                                    
                                       
                                        
                                            | 7 
                                                
                                                    
                                                        
                                                    
                                                        
                                                    
                                                        
                                                    
                                                        
                                                    
                                                     Calculated by us from the COHEN 1987 ratio ${\mathit m}_{{{\mathit n}}}/{\mathit m}_{{{\mathit p}}}$ = $1.001378404$ $\pm0.000000009$. In u, ${\mathit m}_{{{\mathit n}}}{\mathit m}_{{{\mathit p}}}$ = $0.001388434$ $\pm0.000000009~$u. |