73P/Schwassmann-Wachmann 3            r_n reported from La+ and a/b refer to fragment C.         
                                       The published table included a parenthetical value of (1.3)
                                       next to a null entry from Sc, but did not explain the odd  
                                       notation.  The value has been deleted from this table.     
                                                                                                  
109P/Swift-Tuttle                      For this comet, the two r_n values listed in the "Others"  
                                       columns indicate the range of values reported.             
                                                                                                  
117P/Helin-Roman-Alu 1                 In the published table, the Ta+ value of r_n (3.5), was    
                                       accompanied by a right parenthesis without a matching left 
                                       parenthesis.  Based on the spacing and notation used       
                                       elsewhere in the table, the right parenthesis was assumed  
                                       to be a typographical error, and has been dropped in this  
                                       table.                                                     
                                                                                                  
128P/Shoemaker-Holt 1                  Lowry et al. give two snapshot observations of the nucleus,
                                       r_n = 2.12 +/- 0.18km and r_n = 2.48 +/- 0.1 km. The latter
                                       was omitted from this table in the interest of spacing and 
                                       human readability.                                         
                                                                                                  
   C/IRAS-Araki-Alcock       1983 H1   For this comet, the two r_n values listed in the "Others"  
                                       columns indicate the range of values reported.             
                                                                                                  
   C/LINEAR                  1999 S4   Nucleus size measurements were made prior to breakup.