CREATE TABLE table_13351 ("Parameter" TEXT, "Symbol" TEXT, "Best fit  ( WMAP only ) " TEXT, "Best fit  ( WMAP ,  extra parameter ) " TEXT, "Best fit  ( all data ) " TEXT)

What is the best fit (all data) when the best fit (WMAP, extra parameter) shows ?
SELECT "Best fit (all data)" FROM table_13351 WHERE "Best fit (WMAP, extra parameter)" = '—'
SELECT "Best fit (all data)" FROM "table_13351" WHERE "Best fit (WMAP, extra parameter)" = '—'