Betfair graph traded column

[kcon123]

So it says £3,350 was traded at 1.37.

Does that mean £2,445 was put on backing at 1.37 to give a total payout of £3,350?

[valve]

Nope, that means somebody's £1675 on back side was matched with somebody's £1675 on lay side at 1.37.