user: Question: What is the legs when the venue is RWE-Sporthalle, Mülheim and the runner-up (average in final) is Simon Whitlock (99.59)?
Columns: ['Year', 'Champion (average in final)', 'Legs', 'Runner-up (average in final)', 'Sponsor', 'Prize Fund', 'Champion', 'Runner-up', 'Venue']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [2008.0, 'Phil Taylor (104.35)', '11 – 5', 'Adrian Lewis (96.56)', 'PartyPoker.net', '£200,000', '£50,000', '£25,000', 'Südbahnhof, Frankfurt']
SQL:

assistant: SELECT "Legs" FROM "Table" WHERE "Venue" = 'RWE-Sporthalle, Mülheim' AND "Runner-up (average in final)" = 'Simon Whitlock (99.59)';