CREATE TABLE table_63189 ("Transmitter" CLOB, "BBCA" FLOAT, "BBCB" CLOB, "D3&4" CLOB, "ARQA" CLOB, "ARQB" CLOB, "Pol." CLOB, "A.G." CLOB)

What is the AG value associated with a D3&4 of 41?
SELECT "A.G." FROM table_63189 WHERE "D3&4" = '41'
SELECT "A.G." FROM "table_63189" WHERE "D3&4" = '41'