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:
| Driver | Constructor | Laps | Time/Retired | Grid |
| --- | --- | --- | --- | --- |
| Eddie Irvine | Ferrari | 56.0 | 1:36:38.494 | 2.0 |
| Michael Schumacher | Ferrari | 56.0 | +1.040 | 1.0 |
| Mika Häkkinen | McLaren - Mercedes | 56.0 | +9.743 | 4.0 |
| Johnny Herbert | Stewart - Ford | 56.0 | +17.538 | 5.0 |
| Rubens Barrichello | Stewart - Ford | 56.0 | +32.296 | 6.0 |
| Heinz-Harald Frentzen | Jordan - Mugen-Honda | 56.0 | +34.884 | 14.0 |
| Jean Alesi | Sauber - Petronas | 56.0 | +54.408 | 15.0 |
| Alexander Wurz | Benetton - Playlife | 56.0 | +1:00.934 | 7.0 |
| Marc Gené | Minardi - Ford | 55.0 | +1 Lap | 19.0 |
| Alessandro Zanardi | Williams - Supertec | 55.0 | +1 Lap | 16.0 |
| Giancarlo Fisichella | Benetton - Playlife | 52.0 | +4 Laps | 11.0 |
| Jacques Villeneuve | BAR - Supertec | 48.0 | Hydraulics | 10.0 |
| Pedro Diniz | Sauber - Petronas | 44.0 | Spun off | 17.0 |
| Pedro de la Rosa | Arrows | 30.0 | Engine | 20.0 |
| Luca Badoer | Minardi - Ford | 15.0 | Spun off | 21.0 |
| David Coulthard | McLaren - Mercedes | 14.0 | Fuel pressure | 3.0 |
| Ralf Schumacher | Williams - Supertec | 7.0 | Spun off | 8.0 |
| Toranosuke Takagi | Arrows | 7.0 | Transmission | 22.0 |
| Ricardo Zonta | BAR - Supertec | 6.0 | Engine | 13.0 |
| Olivier Panis | Prost - Peugeot | 5.0 | Engine | 12.0 |
| Damon Hill | Jordan - Mugen-Honda | 0.0 | Collision | 9.0 |
| Jarno Trulli | Prost - Peugeot | 0.0 | Engine | 18.0 |
Question:
what is the lowest grid when the laps is more than 7 and the driver is rubens barrichello?
Answer:
6.0