| Answer | Crossword Clue |
|---|---|
| TAU | Letter between sigma and upsilon |
| TAU | Between sigma and upsilon. |
| PHI | Letter between upsilon and chi |
| RHO | Letter between pi and sigma |
| TAU | Sigma-upsilon go-between |
| SIGMA | It's halfway between pi and upsilon |
| PHI | It is between upsilon and chi. |
