sentences:  To make room for this, One's HD feed closed down and One was reduced to two standard definition (SD) feeds.From 2002, this was interspersed with a loop of high definition demonstration material during business hours, for viewing in the showrooms of television retailers, at the conclusion of an equivalent service by Network Ten.Ten HD was officially announced on 14 September 2007, to replace Network Ten's existing high definition service, a simulcast of its standard definition and analogue services, through the use of an amendment to the "Broadcasting Services Act 1992" in 2006.