Table:
text: 2007 Italian motorcycle Grand Prix
250cc classification
250cc classification
Rider Manufacturer Laps Time_Retired Grid
Dirk Heidolf Aprilia 21 +1:10.587 16
Roberto Locatelli Gilera 21 +1:20.650 15
Jules Cluzel Honda 21 +1:20.921 18
Eugene Laverty Honda 21 +1:21.282 25
Hiroshi Aoyama KTM 21 +1:46.776 7
Imre Tóth Aprilia 21 +1:54.965 11
Arturo Tizón Aprilia 20 +1 Lap 23
Thomas Tallevi Yamaha 20 +1 Lap 22
Omar Menghi Aprilia 19 Retirement 17
Mika Kallio KTM 2 Retirement 8
Ratthapark Wilairot Honda 0 Retirement 19

Question: What is the starting grid for the 2007 Italian Grand Prix in the 250cc Dirk Heidelf classification?