CREATE TABLE table_21481509_4 (COUnT VARCHAR, r1b1a2__r_m269_ VARCHAR)

How many n are listed for 0.6% r1b1a2 (r-m269)?
SELECT COUnT AS n FROM table_21481509_4 WHERE r1b1a2__r_m269_ = "0.6%"
SELECT "COUnT" AS "n" FROM "table_21481509_4" WHERE "0.6%" = "r1b1a2__r_m269_"