CREATE TABLE table_63188 ("Transmitter" TEXT, "BBCA" FLOAT, "BBCB" TEXT, "D3&4" TEXT, "ARQA" TEXT, "ARQB" TEXT, "Pol." TEXT, "A.G." TEXT)

What is the A.G. value associated with D3&4 of 46 and transmitter of Seaham?
SELECT "A.G." FROM table_63188 WHERE "D3&4" = '46' AND "Transmitter" = 'seaham'
SELECT "A.G." FROM "table_63188" WHERE "D3&4" = '46' AND "Transmitter" = 'seaham'