CREATE TABLE table_name_94 (parameter VARCHAR(255), best_fit__wmap_only_ VARCHAR(255), symbol VARCHAR(255))
What is the parameter when the best fit (WMAP only) is .9 ± .1, and symbol is a?
    
SQL: SELECT parameter FROM table_name_94 WHERE best_fit__wmap_only_ = ".9 ± .1" AND symbol = "a"