N | Simpson’s error | Rate | Richardson’s extrap. | Rate |
4 | 0.0001333996544004 | −7.579037909266617e−06 | ||
8 | 8.23261474947e−06 | 16.2038 | −1.1185456050277764e−07 | 67.7579 |
16 | 5.12922617490e−07 | 16.0504 | −1.7235246563274131e−09 | 64.8987 |
32 | 3.20325042046e−08 | 16.0125 | −2.6836755040449134e−11 | 64.2225 |
64 | 2.001638854665e−09 | 16.0031 | −4.1877612488860905e−13 | 64.0837 |