| Λ | Quadratic method | Boulton and Straus method | Our improvement method | |
| λ1 | Upp low | 1.060362557981696 1.060361563013190 | 1.060362252449401 1.060362061273195 | 1.061066062252193 1.059658118801031 |
| λ2 | Upp low | 3.799676880351021 3.799638443628093 | 3.799673918715551 3.799672602711578 | 3.797040801641494 3.797040801641494 |
| λ3 | Upp low | 7.455732063205368 7.455606688132128 | 7.455701633603200 7.455694527185979 | 7.462745619537849 7.448650264962926 |
| λ4 | Upp low | 11.644110613912629 11.644649763222517 | 11.644757012619969 11.644727274867936 | 11.659764086317372 11.629726975328792 |
| λ5 | Upp low | 16.262159917276765 16.261391679238212 | 16.261854836128617 16.264709951625957 | 16.289304652770664 16.234347516123545 |