CREATE TABLE table_2138 ("Order" FLOAT, "Couple" TEXT, "Karen" TEXT, "Nicky" TEXT, "Jason" TEXT, "Ruthie" TEXT, "Robin" TEXT, "Total" TEXT, "Skating song" TEXT, "Scoreboard" TEXT, "Public vote" TEXT)

what is the scoreboard when karen was 4.5
SELECT "Scoreboard" FROM table_2138 WHERE "Karen" = '4.5'
SELECT "Scoreboard" FROM "table_2138" WHERE "Karen" = '4.5'