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:
| Star (Pismis24-#) | Spectral type | Magnitude (M bol ) | Temperature (K) | Radius (R ☉ ) | Mass (M ☉ ) |
| --- | --- | --- | --- | --- | --- |
| 1NE | O3.5 If * | −10.0 | 42000.0 | 17.0 | 74.0 |
| 1SW | O4 III | −9.8 | 41500.0 | 16.0 | 66.0 |
| 2 | O5.5 V(f) | −8.9 | 40000.0 | 12.0 | 43.0 |
| 3 | O8 V | −7.7 | 33400.0 | 9.0 | 25.0 |
| 10 | O9 V | −7.2 | 31500.0 | 8.0 | 20.0 |
| 12 | B1 V | −5.3 | 30000.0 | 4.0 | 11.0 |
| 13 | O6.5 III((f)) | −8.6 | 35600.0 | 12.0 | 35.0 |
| 15 | O8 V | −7.8 | 33400.0 | 10.0 | 25.0 |
| 16 | O7.5 V | −9.0 | 34000.0 | 16.0 | 38.0 |
| 17 | O3.5 III | −10.1 | 42700.0 | 17.0 | 78.0 |
| 18 | B0.5 V | −6.4 | 30000.0 | 6.0 | 15.0 |
Question:
What is the smallest possible radius?
Answer:
4.0