user: Question: What's the lengths behind of Jockey Ramon A. Dominguez?
Columns: ['Finish Position', 'Lengths Behind', 'Post Position', 'Horse name', 'Trainer', 'Jockey', 'Owner', 'Post Time Odds']
Types: ['text', 'text', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1 st', '0', 7.0, 'Big Brown', 'Richard E. Dutrow, Jr.', 'Kent J. Desormeaux', 'IEAH Stables', '1-5 favorite']
SQL:

assistant: SELECT "Lengths Behind" FROM "Table" WHERE "Jockey" = 'Ramon A. Dominguez';