| Cutoff Energy (Ryd) | Ground State Energy, MgO | Ground State Energy, CaO |
| 40 | −111.699 | −107.228 |
| 60 | −111.705 | −107.234 |
| 90 | −111.707 | −107.237 |
| 100 | −111.707 | −107.237 |
| 150 | −111.707 | −107.237 |