| Matrix type | Matrix eigenvalues |
| Harmonic squares |
|
| Harmonic |
|
| Harmonic roots |
|
| Very fast geometric decay |
|
| Fast geometric decay |
|
| Geometric decay |
|
| Moderate geometric decay |
|
| Slow geometric decay |
|
| Very slow geometric decay |
|
| Dense equispaced |
|
| Equispaced |
|
| Low-Rank-100 |
|
| Low-Rank-50 |
|
| Low-Rank-10 |
|
| Harmonic Triples |
|
| Multiple-Harmonic |
|
| Multiple-Geometric |
|
| Equispaced-Geometric Gap |
|