| Parameter | Value | 
      
        | Mass    distribution ratio for atenolol (Dm1) | 0.65 | 
      
        | Mass    distribution ratio for pindolol [I.S.] (Dm2) | 1.91 | 
      
        | Relative    retention time (Rr) | 1.76 | 
      
        | Number    of theoretical plates for atenolol (N1) | 2319 | 
      
        | Number    of theoretical plates for pindolol [I.S.] (N2) | 3669 | 
      
        | Resolution(R) | 7.63 | 
      
        | Tailing    factors for atenolol (T1) | 1.06 | 
      
        | Tailing    factors for pindolol [I.S.] (T2) | 1.13 |