SELECT "Best fit (all data)" FROM table_13348 WHERE "Parameter" = 'fluctuation amplitude at 8h −1 mpc'
What is the best fit (all data) when the parameter shows fluctuation amplitude at 8h 1 mpc?
CREATE TABLE table_13348 (
    "Parameter" text,
    "Symbol" text,
    "Best fit (WMAP only)" text,
    "Best fit (WMAP, extra parameter)" text,
    "Best fit (all data)" text
)