Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Companion (in order from star) | Mass | Semimajor axis ( AU ) | Orbital period ( s day ) | Eccentricity | Inclination |
| --- | --- | --- | --- | --- | --- |
| Asteroid belt | 3 AU | 3 AU | 3 AU | 3 AU | — |
| b (unconfirmed) | 1.55 ± 0.24 MJ | 3.38–3.50 | 2,502–2,630 | 0.25–0.702 | — |
| Asteroid belt | 20 AU | 20 AU | 20 AU | 20 AU | — |
| c (unconfirmed) | 0.1 MJ | 40? | 102,270 | 0.3 | — |
| Dust disk | 35–100 AU | 35–100 AU | 35–100 AU | 35–100 AU | — |
Question:
What is the eccentricity when the semimajor axis is 20 au?
Answer:
20 AU