| 
      
        | Parameter | Atorvastatin | Celecoxib |  
        | tR | N | T | tR | N | T |  
        | pH | 3.4 | 2.97 | 4048 | 1.51 | 3.96 | 5148 | 1.41 |  
        | 3.5 | 3.08 | 3451 | 1.30 | 4.35 | 4235 | 1.16 |  
        | 3.6 | 3.15 | 4156 | 1.41 | 4.60 | 5272 | 1.26 |  
        | Mobile phase
 | 82:18 | 2.74 | 2914 | 1.47 | 3.68 | 3534 | 1.27 |  
        | 80:20 | 3.00 | 3115 | 1.46 | 4.03 | 3836 | 1.27 |  
        | 78:22 | 3.33 | 3300 | 1.53 | 4.46 | 4125 | 1.35 |  
        | Flow rate
 | 0.9 | 3.33 | 3341 | 1.52 | 4.47 | 4197 | 1.34 |  
        | 1.0 | 3.15 | 3615 | 1.44 | 4.17 | 4323 | 1.29 |  
        | 1.1 | 2.74 | 2908 | 1.48 | 3.68 | 3522 | 1.28 |  |