| h | L∞ error | r | L2 error | r | H1 error | r |
| 1/8 | 1.4360E−03 | - | 5.2125E−04 | - | 2.8099E−03 | - |
| 1/16 | 3.6011E−04 | 2.00 | 1.3011E−04 | 2.00 | 7.0613E−04 | 1.99 |
| 1/32 | 9.0099E−05 | 2.00 | 3.2532E−05 | 2.00 | 1.7677E−04 | 2.00 |
| 1/64 | 2.2553E−05 | 2.00 | 8.1387E−06 | 2.00 | 4.4214E−05 | 2.00 |
| 1/128 | 5.6702E−06 | 1.99 | 2.0439E−06 | 1.99 | 1.1057E−05 | 2.00 |