user: Question: What is the best fit (all data) when the best fit (WMAP, extra parameter) shows —?
Columns: ['Parameter', 'Symbol', 'Best fit (WMAP only)', 'Best fit (WMAP, extra parameter)', 'Best fit (all data)']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Age of the universe ( Ga )', 't_0', '.4 ± .3', '–', '.7 ± .2']
SQL:

assistant: SELECT "Best fit (all data)" FROM "Table" WHERE "Best fit (WMAP, extra parameter)" = '—';