CREATE TABLE table_204_713 (id DECIMAL, "rank" DECIMAL, "bib" DECIMAL, "athlete" TEXT, "country" TEXT, "time" TEXT, "deficit" TEXT)

which athlete came in after petter northug ?
SELECT "athlete" FROM table_204_713 WHERE "rank" = (SELECT "rank" FROM table_204_713 WHERE "athlete" = 'petter northug') + 1
SELECT "athlete" FROM "table_204_713" WHERE "rank" = (SELECT "rank" FROM "table_204_713" WHERE "athlete" = 'petter northug') + 1