Click the GS toggle on the table, click the + icon on the top-left corner cell, then choose Sliders to enable the pair of axis sliders. Drag either slider to interpolate; the bracketing four cells highlight live.
| 10 | 20 | 30 | 40 | 50 | |
|---|---|---|---|---|---|
| 1000 | 4.2 | 5.1 | 5.9 | 6.4 | 6.7 |
| 6000 | 3.6 | 4.4 | 5.0 | 5.5 | 5.8 |
| 11000 | 3.0 | 3.7 | 4.2 | 4.6 | 4.9 |
| 16000 | 2.5 | 3.0 | 3.5 | 3.9 | 4.2 |
| 21000 | 2.0 | 2.5 | 2.9 | 3.3 | 3.6 |