STOCKHOLM, Sept 13 (Reuters) - Sweden's centre-left opposition bloc is projected to win a one-seat majority in Sunday's vote for parliament, the election authority said.
The bloc, headed by Social Democrats party leader Magdalena Andersson, was expected to win 175 seats in the 349-seat parliament, the agency projected based on votes from 4,853 of Sweden's 6,312 election districts.
The right-wing governing bloc was seen winning 174 seats.
(Reporting by Anna Ringstrom, editing by Terje Solsvik)